Russian strikes killed two people in Kyiv overnight, while a Moscow-backed official said a Ukrainian attack also killed two people in Crimea, ending a three-day halt in attacks Tuesday.

The warring countries had paused attacks on each other's capitals over the weekend as U.S. envoys made a renewed push to narrow the differences between Moscow and Kyiv and steer them toward a peace settlement.

With neither side able to deliver a knockout blow in the war that started after Moscow’s February 2022 invasion and with armies on the front line largely stuck, Russia and Ukraine have in recent months intensified their air war in an effort to grind each other down.

The visit to Moscow and Kyiv by Washington envoys Jared Kushner and Steve Witkoff produced no significant breakthrough that might stop the fighting.

The main targets of Russia's overnight attack were Kyiv and the southern Odesa region. At least 16 people were wounded in Kyiv, Ukraine’s Interior Minister Ivan Vyhivskyi said. There was no immediate tally of casualties in Odesa.