A Russian former deputy prime minister has been injured after shelling hit a hotel in a Russian-controlled area of eastern Ukraine, reports say.
President Joe Biden has told President Volodymyr Zelensky the US will stick by Ukraine "for as long as it takes" in its war with Russia.
Ukraine is tightening up the defence of its border with Belarus over fears that Russia may be preparing a fresh attack, a government official has said.
At least three people have died as a powerful winter storm moves east across the US, spawning tornadoes in southern states and coating others in snow.
The son of two Canadian billionaires has offered an additional C$25m ($18.34m; £14.95m) as a reward for information on his parents' killer.
Elon Musk is no longer the world's richest man after a sharp drop in the value of his shares in electric car company Tesla this year.
A powerful storm has spawned tornadoes in the southern US and brought heavy snowfall and other extreme weather across the US and parts of Canada.
Iran says it has publicly hanged a 23-year-old in what is the second execution linked to the recent anti-government protests.
Four children were taken to hospital in critical condition after being rescued from an icy lake near Birmingham.
Russia's unmanned Luna-25 spacecraft has crashed into the Moon after spinning out of control, officials say.
Donald Trump has confirmed that he will not take part in Republican presidential debates with his rivals in the race for the White House.