DONETSK, Ukraine — Ukraine’s president vowed vengeance in blood after 19 soldiers were killed in an insurgent rocket attack Friday, and residents of this rebel-held city began fleeing in large numbers for fear of a government siege.
The barrage of rocket fire just before sunrise at a base near the Russian border was a devastating setback for government forces, who had seemingly gained the upper hand last weekend when they pushed the pro-Russian fighters out of their stronghold city of Slovyansk. In addition to those killed, 93 soldiers were wounded, the Defense Ministry said.
‘‘For every life of our soldiers, the militants will pay with tens and hundreds of their own,’’ Ukrainian President Petro Poroshenko warned. ‘‘Not one terrorist will evade responsibility. Everybody will get what is coming to them.’’
Ukrainian government troops have been fighting for more than three months against separatists in eastern Ukraine, and in the last two weeks, they have cut the territory held by the rebels in half. Driven from Slovyansk, the rebels have regrouped in Donetsk, an industrial city of 1 million, and Ukraine has said it will cordon off the area.
In anticipation of a siege, leaders of the self-styled Donetsk People’s Republic announced they will evacuate entire neighborhoods. Many residents have rushed to pack up and leave for fear of getting caught in the crossfire, given the insurgents’ strategy of using residential areas for cover.
‘‘The militia has begun blowing up roads, so I want to get out while there is still time. I don’t want to turn into a living shield for the militants,’’ said 56-year old businessman Andrei Koziyatko.
High-end shops are boarded up, and many other businesses, including insurance companies, real estate offices, beauty salons, and notaries, have closed their doors. ‘‘For sale’’ and ‘‘For rent’’ signs abound where there were none a few weeks earlier. Property values have collapsed, with one-bedroom apartments in the city center now selling for $15,000, or one-third of what they cost before.
Estimates of how many people have left vary. The mayor’s office said 30,000. Donetsk People’s Republic prime minister Alexander Boroday put the number at 70,000 and rising.
At the Donetsk train station, people waited in long lines at the ticket office. Four trains a day go to the capital, Kiev, and three others travel in the opposite direction, to the southern Russian city of Rostov-on-Don.
‘‘People are trying to go in any which direction. But all the tickets for the coming week are sold out,’’ station director Irina Nikolaicheva said.
Irina Khodyko, a 38-year old accountant, said she was leaving for Kiev with her 10-year old son and 12-year old daughter. Their apartment is by the once-gleaming international airport — now a bombed-out ruin in a district rendered inaccessible by the daily clashes.
‘‘Life has become impossible. Every day they shoot. All the windows in our apartment are shot out. The children have stopped sleeping,’’ she said.
Khodyko said insurgent forces tried to press-gang her husband, but he fled.