Ukrainian President Volodymyr Zelenskyy plans to visit Turkey this week to revive talks on ending Russia's invasion, which began nearly four years ago. It remains unclear if U.S. representatives will attend, but Russia says it will not send a representative. Earlier talks in Turkey achieved only prisoner exchanges. Heavy U.S. sanctions on Russia's oil industry are set to take effect Friday. On Tuesday, Zelenskyy was in Spain where the government said it would provide Ukraine with aid worth $946 million for defense and reconstruction.. Meanwhile, Ukraine launched aerial attacks on energy infrastructure in the occupied Donetsk region, and Russian drones caused fires in Dnipro. The conflict continues with heavy casualties.