North Korea will send military builders and sappers to help restore Russia's Kursk region after Ukraine's incursion, Moscow's security chief said, in a fresh sign of deepening ties between the two countries.

North Korea will send 6,000 military workers and combat engineers to help rebuild Russia's Kursk region, Moscow's top security official said, in the latest show of growing ties between the two countries.

The U.S. and South Korea say North Korea has shipped ballistic missiles, anti-tank rockets and millions of rounds of ammunition for Russia to use in its war against Ukraine. Moscow and Pyongyang have denied weapons transfers.