KYIV, Ukraine (AP) – The Kremlin has warned it would retaliate after Finland’s leaders said they favor joining NATO. Sweden could do the same within days, in a historic realignment triggered by Russia’s invasion of Ukraine. Meanwhile, the first war-crimes trial of a Russian soldier since the start of the conflict was set to open Friday in Kyiv. A 21-year-old captured member of a tank unit is accused of shooting to death a civilian during the opening week of the war. On the ground, Russian forces pounded areas in central, northern and eastern Ukraine, including the last pocket of resistance in Mariupol. Ukraine recaptured some towns and villages in the northeast.