Russia fired an overnight barrage of more than 300 drones, four cruise missiles and three ballistic missiles, the Ukrainian air force said.

Civilian deaths mounted as Russia continued to press its offensive in eastern Ukraine, claiming to have captured two more villages, as Ukrainian leader Volodymyr Zelenskyy vowed to retaliate with further attacks inside Russia.

Ukrainian drones hit Russia's Sochi resort while Russian forces bombarded Odessa's residential areas and historic Pryvoz market, hours after ceasefire talks collapsed.