Russia launched 36 attack drones against southern Ukraine overnight, damaging infrastructure in the Odesa region, authorities said.
The strikes targeted the Odesa, Mykolaiv and Kherson regions, the Ukrainian military reported, adding that air defence systems destroyed 27 drones.
Odesa Governor Oleh Kiper said unspecified "logistics infrastructure" had been struck but that no injuries were reported.
Reuters could not independently verify the information. There was no immediate comment from Russia.
Russian forces have carried out regular missile and drone strikes on infrastructure in southern Ukraine in recent weeks and months, targeting port facilities in particular.
Separately, the Kherson regional administration said Russia had struck the region 79 times with mortars, artillery and drones over the past day, wounding four people and damaging several buildings.
Several people were killed and others injured after an explosion in a bar in the Swiss ski resort of Crans-Montana, BBC reported on Thursday, citing police.
President Donald Trump's advisers held talks on Wednesday with Ukrainian President Volodymyr Zelenskyy and national security advisers from the UK, France and Germany to discuss the next steps in ending Russia's war in Ukraine, US special envoy Steve Witkoff said.
Russian President Vladimir Putin used his annual televised New Year's address to rally his troops fighting in Ukraine, saying he believed in them and in victory in a war that he has framed as part of an existential struggle with the West.