In Ukraine, pro-Russia separatists are refusing to give up their fight against government forces.
The separatists fled their headquarters in Slovyansk after government forces recaptured it for Ukraine.
The military's success there suggested it might finally be making significant gains in the battle against the rebels.
"This is not a complete victory. But the cleansing of Slovyansk from armed-to-the-teeth gangs of animals has great symbolic importance," Ukraine President Petro Poroshenko said, the Washington Post reported.
"This is the beginning of the fight with militants for the territorial integrity of Ukraine," he said, warning "there are still quite a lot of trials ahead."
The fierce fighting over Slovyask has claimed more than 400 lives since April. Until this weekend, the pro-Russia rebels appeared to have entrenched themselves firmly in the city.
The separatists are regrouping in Donetsk where thousands of rebels and supporters gathered in a central square in the self-proclaimed Donetsk People's Republic.