Ukraine has revoked a Soviet-era deal that allowed visa-free travel for North Koreans, the latest setback for isolated North Korea, which has been under growing pressure since the U.N. Security Council imposed toughened new sanctions in March.

A Ukraine government document said that the government approved a decree on July 27 to terminate the pact with North Korea, a major buyer of Ukraine's flour, that had allowed visa-free travel between the two countries.

The document, signed by Prime Minister Volodymyr Groysman, said the withdrawal of visa-waiver agreement would "prevent ineligible persons from entering Ukraine."