The 50,000-year-old remains of a baby mammoth uncovered by melting permafrost have been unveiled to the public by researchers in Russia's Siberia region who call it the best-preserved mammoth body ever found.

The findings are unique because the mammoth's head and trunk survived all these years. The trunk typically thaws first and is eaten by birds.

Eugene Spector, who was already serving a 3½-year sentence in Russia for bribery, received the additional sentence after being charged with espionage last year.

A Moscow court has on Tuesday sentenced a US citizen to 15 years in prison on espionage charges, according to state-run news agency RIA Novosti.

Secretive North Korea has one of the world’s largest militaries, with 1.28 million active soldiers, but unlike in Russia, the Korean People's Army (KPA) has no recent experience of combat. Pyongyang’s army is “thoroughly indoctrinated but with low readiness,” says Mark Cancian, from the Centre for Strategic and International Studies (CSIS).

Ukrainian President Volodymyr Zelensky confirmed Monday more than 3,000 troops from North Korea have been killed so far fighting next to Russian forces.

Ukrainian President Volodymyr Zelenskiy said on Monday that more than 3,000 North Korean soldiers have been killed and wounded in Russia's Kursk region and warned that Pyongyang could send more personnel and equipment for Moscow's army.

Russian forces have attacked Ukraine with 60 drones over the past 24 hours. Ukrainian air defence units have shot down 36 UAVs, while 23 decoy drones have disappeared from radar due to electronic warfare countermeasures.