Russia carried out a mass attack on Ukraine's energy infrastructure in the early hours of Feb. 7, triggering emergency power outages across most regions, Ukraine's state grid operator Ukrenergo said.

Kyiv — Ukraine and Russia concluded a second round of U.S.-brokered talks in Abu Dhabi on Thursday aimed at ending Europe's biggest conflict since World War Two, with the two sides conducting a major prisoner swap and agreeing to resume negotiations soon.