KYIV, Ukraine—Fighting raged in eastern Ukraine on Orthodox Christmas despite a Russian call for a cease-fire, and Ukrainian President Volodymyr Zelensky welcomed the largest package of military aid from the U.S. and its allies as “timely and strong.”

The General Staff of Ukraine’s armed forces said Russian troops had launched attacks along the front line in the eastern Donetsk region after President Vladimir Putin called for a 36-hour pause in hostilities that was to last through Saturday.

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