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A man holds his hands out over his car as he is searched by pro-Russian servicemen at Chongar checkpoint blocking the entrance to Crimea on March 10, 2014. Russia vowed on March 10 to unveil its own solution to the Ukrainian crisis that would run counter to US efforts and would appear to leave room for Crimea to switch over to Kremlin rule. The unexpected announcement came as Ukraine's new pro-European leaders raced to rally Western support in the face of the seizure by Kremlin-backed forces of the strategic Black Sea peninsula and plans to hold a Sunday referendum on switching Crimea's allegiance from Kiev to Moscow. ALISA BOROVIKOVA/AFP/Getty Images ( 527932169 )

Men hold their hands up on their heads as they are searched by pro-Russian servicemen at Chongar checkpoint blocking the entrance to Crimea on March 10, 2014. Russia vowed on March 10 to unveil its own solution to the Ukrainian crisis that would run counter to US efforts and would appear to leave room for Crimea to switch over to Kremlin rule. The unexpected announcement came as Ukraine's new pro-European leaders raced to rally Western support in the face of the seizure by Kremlin-backed forces of the strategic Black Sea peninsula and plans to hold a Sunday referendum on switching Crimea's allegiance from Kiev to Moscow. ALISA BOROVIKOVA/AFP/Getty Images ( 527932086 )

Men hold their hands up on their heads as they are searched by pro-Russian servicemen at Chongar checkpoint blocking the entrance to Crimea on March 10, 2014. Russia vowed on March 10 to unveil its own solution to the Ukrainian crisis that would run counter to US efforts and would appear to leave room for Crimea to switch over to Kremlin rule. The unexpected announcement came as Ukraine's new pro-European leaders raced to rally Western support in the face of the seizure by Kremlin-backed forces of the strategic Black Sea peninsula and plans to hold a Sunday referendum on switching Crimea's allegiance from Kiev to Moscow. ALISA BOROVIKOVA/AFP/Getty Images ( 527932084 )

A man holds his hands up as he is searched by a pro-Russian serviceman at Chongar checkpoint blocking the entrance to Crimea on March 10, 2014. Russia vowed on March 10 to unveil its own solution to the Ukrainian crisis that would run counter to US efforts and would appear to leave room for Crimea to switch over to Kremlin rule. The unexpected announcement came as Ukraine's new pro-European leaders raced to rally Western support in the face of the seizure by Kremlin-backed forces of the strategic Black Sea peninsula and plans to hold a Sunday referendum on switching Crimea's allegiance from Kiev to Moscow. ALISA BOROVIKOVA/AFP/Getty Images ( 527932215 )

Pro-Russian servicemen search people at Chongar checkpoint blocking the entrance to Crimea on March 10, 2014. Russia vowed on March 10 to unveil its own solution to the Ukrainian crisis that would run counter to US efforts and would appear to leave room for Crimea to switch over to Kremlin rule. The unexpected announcement came as Ukraine's new pro-European leaders raced to rally Western support in the face of the seizure by Kremlin-backed forces of the strategic Black Sea peninsula and plans to hold a Sunday referendum on switching Crimea's allegiance from Kiev to Moscow. ALISA BOROVIKOVA/AFP/Getty Images ( 527932015 )

A man holds his hands on his head as he is searched by pro-Russian servicemen at Chongar checkpoint blocking the entrance to Crimea on March 10, 2014. Russia vowed on March 10 to unveil its own solution to the Ukrainian crisis that would run counter to US efforts and would appear to leave room for Crimea to switch over to Kremlin rule. The unexpected announcement came as Ukraine's new pro-European leaders raced to rally Western support in the face of the seizure by Kremlin-backed forces of the strategic Black Sea peninsula and plans to hold a Sunday referendum on switching Crimea's allegiance from Kiev to Moscow. ALISA BOROVIKOVA/AFP/Getty Images ( 527932140 )

Pro-Russian servicemen search a man at Chongar checkpoint blocking the entrance to Crimea on March 10, 2014. Russia vowed on March 10 to unveil its own solution to the Ukrainian crisis that would run counter to US efforts and would appear to leave room for Crimea to switch over to Kremlin rule. The unexpected announcement came as Ukraine's new pro-European leaders raced to rally Western support in the face of the seizure by Kremlin-backed forces of the strategic Black Sea peninsula and plans to hold a Sunday referendum on switching Crimea's allegiance from Kiev to Moscow. AFP PHOTO/ ALISA BOROVIKOVAALISA BOROVIKOVA/AFP/Getty Images ( 527931960 )

A Pro-Russian serviceman searches a man at Chongar checkpoint blocking the entrance to Crimea on March 10, 2014. Russia vowed on March 10 to unveil its own solution to the Ukrainian crisis that would run counter to US efforts and would appear to leave room for Crimea to switch over to Kremlin rule. The unexpected announcement came as Ukraine's new pro-European leaders raced to rally Western support in the face of the seizure by Kremlin-backed forces of the strategic Black Sea peninsula and plans to hold a Sunday referendum on switching Crimea's allegiance from Kiev to Moscow. ALISA BOROVIKOVA/AFP/Getty Images ( 527931943 )

A pro-Russian serviceman mans his position at the Chongar check point blocking the entrance to Crimea on March 7, 2014. Two buses carrying OSCE observers trying to enter Crimea turned back Friday after being blocked by armed men at a checkpoint, an AFP reporter said. Two sources within the mission said the team of 47 military and civilian observers was returning to the Ukrainian city of Kherson where they had spent the night after being similarly blocked on Thursday. ALEXANDER NEMENOV/AFP/Getty Images ( 527844643 )

Pro-Russian servicemen man their position at the Chongar check point blocking the entrance to Crimea on March 7, 2014. Two buses carrying OSCE observers trying to enter Crimea turned back Friday after being blocked by armed men at a checkpoint, an AFP reporter said. Two sources within the mission said the team of 47 military and civilian observers was returning to the Ukrainian city of Kherson where they had spent the night after being similarly blocked on Thursday. ALEXANDER NEMENOV/AFP/Getty Images ( 527844659 )

A tractor makes pits next to a check point in Chongar on March 7, 2014. Spreading out from the road by the checkpoint there is a perfect row of holes dug into the earth, each about half-a-metre wide, in what looked like the first steps of installing a border fence. Signs nearby warned of mines and were marked "Stop! Danger to Life!" with a skull-and-crossbones. ALEXANDER NEMENOV/AFP/Getty Images ( 527876594 )

OSCE military observers take photos during negotiations with pro-Russian soldier forces at the Chongar check point blocking the entrance to Crimea on March 7, 2014. Two buses carrying OSCE observers trying to enter Crimea turned back Friday after being blocked by armed men at a checkpoint, an AFP reporter said. Two sources within the mission said the team of 47 military and civilian observers was returning to the Ukrainian city of Kherson where they had spent the night after being similarly blocked on Thursday. ALEXANDER NEMENOV/AFP/Getty Images ( 527844636 )

OSCE military observers negotiate with a pro-Russian soldier (R) at the Chongar check point blocking the entrance to Crimea on March 7, 2014. Two buses carrying OSCE observers trying to enter Crimea turned back Friday after being blocked by armed men at a checkpoint, an AFP reporter said. Two sources within the mission said the team of 47 military and civilian observers was returning to the Ukrainian city of Kherson where they had spent the night after being similarly blocked on Thursday. ALEXANDER NEMENOV/AFP/Getty Images ( 527844677 )

OSCE military observers talk on the phone as they wait at the Chongar check point blocking the entrance to Crimea on March 7, 2014. Two buses carrying OSCE observers trying to enter Crimea turned back Friday after being blocked by armed men at a checkpoint, an AFP reporter said. Two sources within the mission said the team of 47 military and civilian observers was returning to the Ukrainian city of Kherson where they had spent the night after being similarly blocked on Thursday. ALEXANDER NEMENOV/AFP/Getty Images ( 527844737 )

Ukrainians carrying their country's flags stage a protest at the Chongar check point blocking the entrance to Crimea on March 7, 2014. Two buses carrying OSCE observers trying to enter Crimea turned back Friday after being blocked by armed men at a checkpoint, an AFP reporter said. Two sources within the mission said the team of 47 military and civilian observers was returning to the Ukrainian city of Kherson where they had spent the night after being similarly blocked on Thursday. ALEXANDER NEMENOV/AFP/Getty Images ( 527844777 )

Pro-Russia supporters wave Crimean flags at Chongar checkpoint blocking the entrance to Crimea on March 10, 2014. Russia vowed on March 10 to unveil its own solution to the Ukrainian crisis that would run counter to US efforts and would appear to leave room for Crimea to switch over to Kremlin rule. The unexpected announcement came as Ukraine's new pro-European leaders raced to rally Western support in the face of the seizure by Kremlin-backed forces of the strategic Black Sea peninsula and plans to hold a Sunday referendum on switching Crimea's allegiance from Kiev to Moscow. ALISA BOROVIKOVA/AFP/Getty Images ( 527932335 )

A pro-Russia supporter waves a Crimean flag at Chongar checkpoint blocking the entrance to Crimea on March 10, 2014. Russia vowed on March 10 to unveil its own solution to the Ukrainian crisis that would run counter to US efforts and would appear to leave room for Crimea to switch over to Kremlin rule. The unexpected announcement came as Ukraine's new pro-European leaders raced to rally Western support in the face of the seizure by Kremlin-backed forces of the strategic Black Sea peninsula and plans to hold a Sunday referendum on switching Crimea's allegiance from Kiev to Moscow. ALISA BOROVIKOVA/AFP/Getty Images ( 527932340 )

An armed pro-Russian serviceman stands guard at Chongar checkpoint blocking the entrance to Crimea on March 10, 2014. Russia vowed on March 10 to unveil its own solution to the Ukrainian crisis that would run counter to US efforts and would appear to leave room for Crimea to switch over to Kremlin rule. The unexpected announcement came as Ukraine's new pro-European leaders raced to rally Western support in the face of the seizure by Kremlin-backed forces of the strategic Black Sea peninsula and plans to hold a Sunday referendum on switching Crimea's allegiance from Kiev to Moscow. ALISA BOROVIKOVA/AFP/Getty Images ( 527932262 )

Armed pro-Russian servicemen stand guard at Chongar checkpoint blocking the entrance to Crimea on March 10, 2014. Russia vowed on March 10 to unveil its own solution to the Ukrainian crisis that would run counter to US efforts and would appear to leave room for Crimea to switch over to Kremlin rule. The unexpected announcement came as Ukraine's new pro-European leaders raced to rally Western support in the face of the seizure by Kremlin-backed forces of the strategic Black Sea peninsula and plans to hold a Sunday referendum on switching Crimea's allegiance from Kiev to Moscow. ALISA BOROVIKOVA/AFP/Getty Images ( 527932246 )

A pro-Russian serviceman checks a car at Chongar checkpoint blocking the entrance to Crimea on March 10, 2014. Russia vowed on March 10 to unveil its own solution to the Ukrainian crisis that would run counter to US efforts and would appear to leave room for Crimea to switch over to Kremlin rule. The unexpected announcement came as Ukraine's new pro-European leaders raced to rally Western support in the face of the seizure by Kremlin-backed forces of the strategic Black Sea peninsula and plans to hold a Sunday referendum on switching Crimea's allegiance from Kiev to Moscow. ALISA BOROVIKOVA/AFP/Getty Images ( 527932188 )

A pro-Russian serviceman checks a driver's documents at Chongar checkpoint blocking the entrance to Crimea on March 10, 2014. Russia vowed on March 10 to unveil its own solution to the Ukrainian crisis that would run counter to US efforts and would appear to leave room for Crimea to switch over to Kremlin rule. The unexpected announcement came as Ukraine's new pro-European leaders raced to rally Western support in the face of the seizure by Kremlin-backed forces of the strategic Black Sea peninsula and plans to hold a Sunday referendum on switching Crimea's allegiance from Kiev to Moscow. ALISA BOROVIKOVA/AFP/Getty Images ( 527932194 )

Pro-Russian servicemen stop a truck at Chongar checkpoint blocking the entrance to Crimea on March 10, 2014. Russia vowed on March 10 to unveil its own solution to the Ukrainian crisis that would run counter to US efforts and would appear to leave room for Crimea to switch over to Kremlin rule. The unexpected announcement came as Ukraine's new pro-European leaders raced to rally Western support in the face of the seizure by Kremlin-backed forces of the strategic Black Sea peninsula and plans to hold a Sunday referendum on switching Crimea's allegiance from Kiev to Moscow. ALISA BOROVIKOVA/AFP/Getty Images ( 527932210 )