Ukraine's much-anticipated counteroffensive has finally begun. The Ukrainians are armed with Western weapons, including tanks and armored vehicles, but they are facing tough Russian defenses. The initial phases of this operation may be the most dangerous and costly, war experts say.The Ukrainian counteroffensive has begun, kicking off a particularly dangerous time for Ukraine's armed forces, even with its newly acquired arsenal of Western-made tanks, armored vehicles, and other weaponry that has been pouring in over months."Amidst a highly complex operational picture, heavy fighting continues along multiple sectors of the front," the British defense ministry said in a Thursday update, noting...