Ukrainian President Zelensky denounces Russian 'terror' in UN address

Ukrainian president Volodymyr Zelensky has accused Russia of "crimes against humanity" after a new missile barrage caused blackouts across the country.

He told the UN Security Council via videolink that the Russian "formula of terror" had forced "millions of people to stay without energy supplies, without heating, without water" in sub-zero cold.

The strikes killed at least seven people, Ukraine said, and nuclear power plants went off-line.

Moscow has said that attacking Ukraine's power grid could weaken Kyiv's ability to fight and drive its leaders to the negotiating table.