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A car drives past residential buildings in Pyongyang, on April 11, 2012. Chinese currency and U.S. dollars are being used more widely than ever in North Korea instead of the country's own money. The use of dollars and Chinese yuan, or renminbi, has accelerated since a revaluation of the North Korean won in 2009 wiped out the savings of millions of people, said experts on the country, defectors and Chinese border traders. REUTERS/Bobby Yip/Files ( KOREA-NORTH/MONEY )

A North Korean man looks at toiletry articles at a department store in North Korea's capital Pyongyang on October 17, 2005. Chinese currency and U.S. dollars are being used more widely than ever in North Korea instead of the country's own money. The use of dollars and Chinese yuan, or renminbi, has accelerated since a revaluation of the North Korean won in 2009 wiped out the savings of millions of people, said experts on the country, defectors and Chinese border traders. REUTERS/Reinhard Krause ( KOREA-NORTH/MONEY )

A North Korean iron ore mine (L) is seen near the North Korean town of Musan on May 11, 2013. Chinese currency and U.S. dollars are being used more widely than ever in North Korea instead of the country's own money. The use of dollars and Chinese yuan, or renminbi, has accelerated since a revaluation of the North Korean won in 2009 wiped out the savings of millions of people, said experts on the country, defectors and Chinese border traders. REUTERS/John Ruwitch ( KOREA-NORTH/MONEY )

Men sit on a roof near the North Korean city of Hyesan, across the Yalu River from the Chinese town of Changbai May 12, 2013. Chinese currency and U.S. dollars are being used more widely than ever in North Korea instead of the country's own money. The use of dollars and Chinese yuan, or renminbi, has accelerated since a revaluation of the North Korean won in 2009 wiped out the savings of millions of people, said experts on the country, defectors and Chinese border traders. REUTERS/John Ruwitch ( KOREA-NORTH/MONEY )

Children play on the banks of a river near the North Korean city of Hyesan, across the Yalu River from the Chinese town of Changbai on May 12, 2013. Chinese currency and U.S. dollars are being used more widely than ever in North Korea instead of the country's own money. The use of dollars and Chinese yuan, or renminbi, has accelerated since a revaluation of the North Korean won in 2009 wiped out the savings of millions of people, said experts on the country, defectors and Chinese border traders. REUTERS/John Ruwitch ( KOREA-NORTH/MONEY )

People walk on a bridge at the North Korean city of Hyesan, across the Yalu River from the Chinese town of Changbai May 12, 2013. Chinese currency and U.S. dollars are being used more widely than ever in North Korea instead of the country's own money. The use of dollars and Chinese yuan, or renminbi, has accelerated since a revaluation of the North Korean won in 2009 wiped out the savings of millions of people, said experts on the country, defectors and Chinese border traders. REUTERS/John Ruwitch ( KOREA-NORTH/MONEY )

People walk along a street in the North Korean city of Musan May 11, 2013. Chinese currency and U.S. dollars are being used more widely than ever in North Korea instead of the country's own money. The use of dollars and Chinese yuan, or renminbi, has accelerated since a revaluation of the North Korean won in 2009 wiped out the savings of millions of people, said experts on the country, defectors and Chinese border traders. REUTERS/John Ruwitch ( KOREA-NORTH/MONEY )

The North Korean city of Hyesan (top), is seen across the Yalu River from the Chinese town of Changbai in this general view taken May 12, 2013. Chinese currency and U.S. dollars are being used more widely than ever in North Korea instead of the country's own money. The use of dollars and Chinese yuan, or renminbi, has accelerated since a revaluation of the North Korean won in 2009 wiped out the savings of millions of people, said experts on the country, defectors and Chinese border traders. REUTERS/John Ruwitch ( KOREA-NORTH/MONEY )

People wash clothes on the banks of a river near the North Korean city of Hyesan, across the Yalu River from the Chinese town of Changbai May 12, 2013. Chinese currency and U.S. dollars are being used more widely than ever in North Korea instead of the country's own money. The use of dollars and Chinese yuan, or renminbi, has accelerated since a revaluation of the North Korean won in 2009 wiped out the savings of millions of people, said experts on the country, defectors and Chinese border traders. REUTERS/John Ruwitch ( KOREA-NORTH/MONEY )

The North Korean city of Hyesan, across the Yalu River from the Chinese town of Changbai is seen in this general view taken May 12, 2013. Chinese currency and U.S. dollars are being used more widely than ever in North Korea instead of the country's own money. The use of dollars and Chinese yuan, or renminbi, has accelerated since a revaluation of the North Korean won in 2009 wiped out the savings of millions of people, said experts on the country, defectors and Chinese border traders. The characters read, "Absolutely and resolutely implement the teachings of the Great Leader Comrade Kim Jong-il!". REUTERS/John Ruwitch ( KOREA-NORTH/MONEY )

A North Korean iron ore mine, near the North Korean town of Musan is seen in this general view taken May 11, 2013. Chinese currency and U.S. dollars are being used more widely than ever in North Korea instead of the country's own money. The use of dollars and Chinese yuan, or renminbi, has accelerated since a revaluation of the North Korean won in 2009 wiped out the savings of millions of people, said experts on the country, defectors and Chinese border traders. REUTERS/John Ruwitch ( KOREA-NORTH/MONEY )

A Mercedes-Benz car is seen parked outside the People's Cultural Palace where the World Congress on the Juche Idea is being held in Pyongyang, in this April 12, 2012 file photo. Chinese currency and U.S. dollars are being used more widely than ever in North Korea instead of the country's own money. The use of dollars and Chinese yuan, or renminbi, has accelerated since a revaluation of the North Korean won in 2009 wiped out the savings of millions of people, said experts on the country, defectors and Chinese border traders. REUTERS/John Ruwitch ( KOREA-NORTH/MONEY )