The U.S. is deploying a Patriot missile system to Slovakia, along with troops to operate it, after Slovakia sent a long-range, anti-aircraft battery to Ukraine, chief Pentagon spokesman John Kirby said Friday. Ukrainian officials have been asking other countries to donate the S-300 anti-aircraft system, which is a Soviet Union-era …

Russian ally Serbia took the delivery of a sophisticated Chinese anti-aircraft system in a veiled operation this weekend, amid Western concerns that an arms buildup in the Balkans at the time of the war in Ukraine could threaten the fragile peace in the region. Media and military experts said Sunday …

Russia has tapped a new Ukraine war commander to take centralized control of the next phase of battle after its costly failures in the opening campaign and carnage for Ukrainian civilians. U.S. officials don’t see one man making a difference in Moscow’s prospects. Russia turned to Gen. Alexander Dvornikov, 60, …