Kiev accused rebels of trying to seize as much territory as possible before both sides are due to halt fighting.
Talks between Ukraine and separatists lasted a mere four hours Saturday.
Four government servicemen were killed in the last 24 hours of fighting in the city, according to Ukraine's military.
At least 30 civilians are dead after rocket fire rained down on a new front in eastern Ukraine. Moscow appears to be using the offensive to extract a new settlement from Kiev and the West.
Scots living outside the country aren't eligible to vote in the historic independence referendum. Neither are cats. But that doesn't mean they can't have opinions.
Over 1,000 Russian troops have joined separatists to fight Ukrainian forces in the southeast, says NATO.
Journalists Anton Skiba, working for CNN, and Graham Phillips, working for Russia Today, have been abducted in Donetsk, media outlets say.
But U.S. officials say Russia "created the conditions" for the downing of Flight 17.
Newly elected president Petro Poroshenko declared a national day of mourning and vowed an "appropriate response."
In the eastern city of Donetsk, friends and neighbors have transformed into enemies, and people on both sides of the conflict worry that there's no way out from a slide to civil war.
When the U.S. first announced sanctions against Moscow over the conflict in Ukraine, Russia's pets spoke up. As pro-Russian rebel groups occupy government buildings in eastern Ukraine, cats, dogs, bunnies and even geese are taking sides.
Failed Republican presidential candidate Ron Paul's fanatical supporters are not willing to compromise.