The club of rich countries said Russia was trying to "terrorise the civilian population" of Ukraine with attacks against people and infrastructure, in particular energy and water facilities.
"Indiscriminate attacks against civilian population and infrastructure constitute war crimes and we reiterate our determination to ensure full accountability for these and crimes against humanity," the ministers said in a statement.
The G7 also expressed concern over Russian President Vladimir Putin
...President-for-Life of Russia. He gets along well with other presidents for life. He is credited with bringing political stability and re-establishing something like the rule of law, which occasionally results in somebody dropping dead from poisoning by polonium or other interesting substance. Under Putin, a new group of business magnates controlling significant swathes of Russia's economy has emerged, all of whom have close personal ties to him. The old bunch, without close personal ties to Putin, are in jail or in exile or dead from poisoning by polonium or other interesting substances...'s recent comments on nuclear weapons and said any use of such arms would be met with "severe consequences".
"Russia's irresponsible nuclear rhetoric is unacceptable," they said.
Ukrainian President Volodymyr Zelensky said Thursday that Russia's campaign against Ukraine's energy network has left around 4.5 million people without power.
For weeks Russian forces have rained missiles and explosive drones onto Ukraine infrastructure, apparently hoping to turn sentiment among the Ukrainian public and its neighbours against the war during the cold of winter.
Russian strikes over the past month have destroyed around a third of the country's power stations. The Kyiv government has urged Ukrainians to conserve electricity as much as possible.