North Korea has sent approx 6,700 containers carrying millions of ammunitionin Russia from July, South Korea announced on Tuesday.

Shipments may have included more than 3 million 152mm artillery shells or 500,000 122mm shells, Defense Minister Shin Won-sik announced.

“It could possibly be a combination of both, and you can say that at least several million shells have been sent,’ Shin said, according to Yonhap, South Korea’s state news agency.

He claimed, however, that hundreds of North Korean munitions factories are operating about 30% of their capacity due to lack of raw materials and electricity.

However, he said that as many factories produce artillery shells for Russia they work at 100%.

Seoul and Washington have accused Pyongyang and Moscow of trading arms, and condemned North Korea for supplying Russia with weapons for use against Ukraine.

Both countries denied this, even as they pledged to strengthen military cooperation between them.