Western sanctions have made it difficult for Russia to buy new military equipment. Due to this, Russia is forced to buy military hardware from North Korea.
The New York Times said this information in a report citing US intelligence. Russia has bought millions of artillery shells and missiles from North Korea in the past few months.
A US official said Moscow would be forced to buy more military equipment from North Korea if the war with Ukraine continues.
Last week, various media reports said that Russia received the first shipment of Iranian-made drones.
Iran and North Korea are under various sanctions of the United States and Western countries. Both countries are trying to strengthen relations with Russia after the war started last February.
North Korean President Kim Jong Un blamed the US for the war.