A US military convoy arriving in the Czech Republic this weekend will encounter both warm welcomes and disdain as rival activists seek to show their opposing views regarding Moscow’s incursions into eastern Ukraine. Pavel Safr, a leading activist behind plans to greet some 500 US soldiers with friendly signs, is concerned that anti-convoy demonstrators will send the wrong message. “I’m acutely troubled by that my country could look like it’s siding with Russia,” Mr. Safr said.