North Korean leader Kim Jong Un said the United States and the West are using the Ukrainian military as "shock troops" to fight Russia and risk triggering a global conflict, state media reported Monday.
Seoul and Washington have accused the nuclear-armed North of sending more than 10,000 soldiers to help Russia fight Ukraine, with experts saying Kim was eager for Moscow's advanced technology, plus battle experience for his troops, in return.
Pyongyang has denied the deployment, and Kim did not mention it in a speech to battalion commanders carried by the official Korean Central News Agency.
The US and the West are using the conflict in Ukraine to "expand the scope of their military interventions globally", Kim said.
They are also trying to "enhance their combat experience, with Ukraine being used as shock troops" against Russia, he said.
Washington's "continuing military assistance to Ukraine... raises the concern of World War III," he said.
Kim vowed his country would bolster its nuclear weapons defence "without limit".
His warning comes after Seoul said last week that North Korean troops had already begun "engaging in combat operations" alongside Russian forces near the border with Ukraine.
Kim "is likely keeping in mind the possibility of additional deployments to support Russia's war in Ukraine," said Hong Min, a senior analyst at the Korea Institute for National Unification.
Last week, North Korea ratified a landmark defence pact with Russia, formalising months of tightening military bonds between two nations that were Communist allies throughout the Cold War.
In exchange for sending troops, the West fears Russia is offering North Korea technological support that could advance Pyongyang's nuclear weapons programme.
The reclusive state recently fired a salvo of ballistic missiles and tested a new solid-fuel ICBM.
The nuclear-armed state's deployment of troops to Russia has led to a shift in tone from Seoul, which has resisted calls to send lethal weapons to Kyiv so far but recently indicated it might change its no-provision policy.
Russia downs 59 Ukrainian drones
Russia downed 59 Ukranian drones overnight, the majority across border regions, the defence ministry said Monday.
"During the past night, attempts by the Kyiv regime to carry out terrorist UAV attacks against targets on the territory of the Russian Federation were thwarted," the ministry said in a statement.
"Fifty-nine Ukrainian UAVs were destroyed by air defence systems," it added.
The ministry said the majority of drones were downed across three regions bordering Ukraine: 45 in Bryansk, six in Kursk and three in Belgorod.
Three drones were intercepted in the region of Tula, south of the capital, while two others were downed over the Moscow region.
Sergei Sobyanin, mayor of Moscow, said one was destroyed over the Ramenskoye district without causing casualties or damage.
The second was located in Pavlovo-Possad district, he said on Telegram.
Moscow announces almost daily that it has destroyed Ukranian drones, but the number is usually lower than Monday's figure.
Kyiv says it carries out such attacks, which often target energy infrastructure, in response to Russian bombardment of its territory.