Russian troops abandoned a key Ukrainian city so rapidly that they left the bodies of their comrades in the streets, offering more evidence Tuesday of Moscow’s latest military defeat as it struggles to hang on to four regions of Ukraine that it illegally annexed last week. (snip) Over the weekend, Russian troops pulled back from Lyman, a strategic eastern town that the Russians had used as a logistics and transport hub, to avoid being encircled by Ukrainian forces. The town’s liberation gave Ukraine an important vantage point for pressing its offensive deeper into Russian-held territories. Two days later, an Associated...