The leaders of the Group of Seven economies pledged to levy further sanctions on Russia in a bid to stop its war in Ukraine, according to a joint statement released after their online summit Friday, the first anniversary of Moscow's invasion of its neighbor.

Ukrainian President Volodymyr Zelenskyy joined the video gathering, the first summit presided over by Japanese Prime Minister Fumio Kishida. Japan, this year's chair of the G7, is scheduled to host the three-day in-person summit in May.

The G7 members reaffirmed their "unwavering support" for Kyiv during their virtual summit, the joint statement said, with worries mounting that Moscow may launch a large-scale offensive in Ukraine in the spring.