Ukrainian and Russian negotiators began a second day of U.S.-brokered talks in Abu Dhabi on Saturday after an overnight wave of Russian airstrikes that knocked out power for millions of people amid fr...

Security and defence editor Deborah Haynes was in Kyiv overnight while Russia launched a "massive attack" on Ukraine's two largest cities.

Kremlin aide Yuri Ushakov told reporters the talks, which began shortly before midnight and lasted some four hours, had been "substantive, constructive and very frank".