President Biden pledged to help strengthen Ukraine’s air defense system as he and other G7 heads of state spoke with Ukrainian President Volodymyr Zelensky ahead of a virtual summit today. The talks come after another weekend of heavy fighting in Ukraine. Russia launched a drone attack on the port city of Odessa Saturday, cutting power to 1.5 million people. Ukrainian forces meanwhile struck the southern, Russian-occupied city of Melitopol, reportedly using U.S.-supplied long-range HIMARS rockets. Ukraine also reported it killed a number of fighters from the private military Wagner Group after targeting its headquarters in the Russian-occupied Luhansk region.