More than 70 Ukrainian soldiers killed near Kharkiv | First Thing

Rescuers searching rubble of base in eastern Ukraine as Russian forces gather outside Kyiv. Plus, Joe Biden prepares for his first State of the Union address

Good morning.

Russia is not showing any signs of easing up its attack on Ukraine. More than 70 Ukrainian soldiers have been killed in the eastern city of Okhtyrka after a Russian missile strike on a military base, in what is thought to be the biggest loss of life in a single incident in Moscow's invasion.

What do we know on day six of Russia's invasion? At least nine people had been killed, including three children, and 37 wounded in one day after the shelling in Kharkiv, the city's mayor said. Here's what else we know.

Has Russia committed war crimes? There are grounds for an investigation, according to the prosecutor of the international criminal court (ICC) in The Hague. He has announced that he will launch an investigation into possible war crimes or crimes against humanity in Ukraine.

When will the court hear the arguments? The court did not set a date for arguments. It typically issues decisions several months after that, but could be inclined to rule on an expedited basis given the urgency of New York attorney general, Letitia James's investigation and the Trumps' desire to swiftly overturn Engoron's ruling.