Russia is allowing thousands of fresh North Korean laborers into the country and granting new work permits in potential violation of U.N. sanctions, the Wall Street Journal reported Thursday.

Over 10,000 new North Korean workers have registered in Russia since September, the paper said, citing records from the Russian Interior Ministry.

Russia's action potentially violates U.N. sanctions to reduce cash flows to North Korea and puts pressure on Pyongyang to give up its nuclear weapons, the Journal reported, citing U.S. officials.