KYIV, Dec 16 (Reuters) - Russia pounded Ukraine with missiles on Friday, hitting critical infrastructure across the country and knocking out power as people took cover in shelters, Ukrainian officials said.
Kharkiv, the central city of Poltava and parts of Kyiv were left without electricity and the northern Sumy region suffered power outages, regional officials said.
Loud explosions echoed through Kyiv, Reuters witnesses in the capital said, and air defences systems were in operation across Ukraine.
Russia was "massively attacking" Ukraine," said Oleksiy Kuleba, governor of the Kyiv region.
Russia, which invaded Ukraine in February, has been attacking Ukrainian energy infrastructure since October, causing repeated power outages across the country at the start of winter.