The violence in Ukraine escalated Monday as a prominent mayor was shot and critically wounded, marchers at a pro-Ukraine rally were set upon by men with clubs, and pro-Russian separatists expanded to another eastern city despite Kiev's military campaign to contain them.

Gennady Kernes, the mayor of Kharkiv, Ukraine's second-largest city after the capital Kiev, was shot in the back while biking along a highway, according to city officials. He was taken to a hospital with extensive internal damage and underwent a two-hour surgery....