Ukrainian President Volodymyr Zelensky appears on a screen as German Chancellor Olaf Scholz attends a virtual G7 leaders meeting at the Chancellery in Berlin, Germany, on Tuesday. Reuters

World powers said on Tuesday after talks on Ukraine with President Volodymyr Zelensky that they would hold Russian leader Vladimir Putin responsible for recent widespread aerial strikes on cities including Kyiv.

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"We condemn these attacks in the strongest possible terms and recall that indiscriminate attacks on innocent civilian populations constitute a war crime," the G7 said in a statement. "We will hold President Putin and those responsible to account."

Japanese Prime Minister Fumio Kishida said on Tuesday Russia's possible use of nuclear weapons is highly unpredictable and the situation must be closely watched.

France's President Emmanuel Macron (second from right) participates in a video conference in Paris. AP

Kishida's comment to reporters came after he attended a virtual meeting of G7 leaders on Russia's invasion of Ukraine.

"The situation does not at all allow any prediction. It requires serious, close attention," said Kishida, who comes from Hiroshima.

"For the past 77 years, the world has continued to put a stop to using nuclear weapons. This history of not using nuclear weapons must continue further."