More from our news desk on the agreed cease-fire:
Ukraine and the pro-Russian rebels say they have agreed to halt fire across the eastern war zone on December 9 under the terms of a September truce agreement.
Ukrainian President Petro Poroshenko said on December 4 that the terms of the new cease-fire were included in an earlier peace deal agreed with the help of European representatives in the Belarusian capital, Minsk, on September 5.
But the Minsk agreement published at the time made no mention of a specific date on which the two sides were due to lay down their arms.
Andrei Purgin, the self-styled parliament speaker of the self-declared Donetsk People's Republic, confirmed that the cease-fire was part of the Minsk deal.
More than 4,300 people have died in the fighting in eastern Ukraine in the past eight months.