Russia-Ukraine war live updates: Moscow reports concert terror attack link to Kyiv; Zelenskyy says Ukraine stabilized battle positions

This is CNBC's live blog tracking developments on the war in Ukraine.

Ukrainian President Volodymyr Zelenskyy said his forces have managed to "stabilize" their battlefield positions despite a significant decrease in ammunition supplies, speaking during his nightly address to the nation. He said that four people were killed in a Russian drone strike in the Kharkiv region a day prior, a figure that included three rescue workers.

Ukraine's Air Force said it shot down 13 Iranian-made Shahed drones launched by Russian forces from Crimea. CNBC is not able to independently verify developments on the ground.

Ukraine has managed to "stabilize" its positions on the home battlefield, in "all those areas of the front where the Russian army expected to succeed at the moment," Ukrainian Volodymyr Zelenskyy said in his nightly address.

"Given the shortage of shells and a significant slowdown in supplies, these results are really good," the head of state assessed, noting he has tasked the missile program to provide Ukrainian defense forces with a "robust and increasing missile support."

Zelenskyy separately acknowledged four people were killed in Kharkiv in northeastern Ukraine on Thursday, following a Russian strike with an Iranian-make "Shahed" drone on a residential area. The toll included three rescuers from Ukraine's state emergency service.

The Kyiv leader added he has spoken with the military to bolster air defense for Kharkiv, Sumy and the country's southern regions.

— Ruxandra Iordache

Russian forces carried out an overnight attack with anti-aircraft guided missiles and ballistic projectiles from the Belgorod region north of the border with Ukraine, the Ukrainian air force reported in a Google-translated post on Telegram.

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