US
President Barack Obama has urged his Russian counterpart Vladimir Putin
in a phone call to agree to a peace deal with the Ukrainian government.
"If Russia continues its aggressive actions in Ukraine, including by
sending troops, weapons, and financing to support the separatists, the
costs for Russia will rise," said a statement issued by the White House
on Tuesday.
The Kremlin, however, emphasised in its statement about the call that the Ukraine crisis was an "internal" conflict.
Kiev and the West accuse Moscow of supplying and training the heavily armed separatists, but Russia denies the claims.
Peace efforts
The leaders of Ukraine, Russia, Germany and France are set to meet
for the peace talks in the Belarusian capital of Minsk on Wednesday.
French President Francois Hollande said the leaders were heading to
the talks "with the strong will to succeed, but without being sure that
we will be able to do it".
German Foreign Minister Frank-Walter Steinmeier said simply holding
the summit was no guarantee of success, and that nothing had been
resolved yet.
Meanwhile, Ukrainian President Petro Poroshenko said the talks were
"one of the last" opportunities for ending the conflict that has killed
more than 5,300 people since April.
The renewed fighting has brought calls in the West for more pressure
against Moscow. Obama is weighing whether to deliver lethal weapons to
Kiev.
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Fresh fighting in Ukraine threatens peace talks
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Obama met German Chancellor Angela Merkel on Monday but announced no
decision on weapons, despite several senior officials in his
administration coming out last week in favour of sending arms.
European countries have opposed sending arms to Kiev, arguing that would escalate the war.
Latest violence
Meanwhile on Tuesday, rockets crashed into the eastern Ukrainian city
of Kramatorsk, about 50km north of the front line, hitting the
headquarters of the Ukrainian military campaign in the east, as well as
nearby residential areas.
The government-controlled Donetsk regional administration said
12 people were killed and 64 wounded, including 29 civilians. At least
seven of the dead were civilians, local officials said.
The rebels denied firing on the town.
At the front line in Vuhlehirsk, a small town captured by rebels last
week, volleys of artillery crashed in both directions. The rebels are
pushing to encircle government forces, holding out in nearby Debaltseve,
a rail hub that is the main rebel target.
Rebels sounded triumphant and said they had no intention of halting their offensive.
"The Debaltseve bubble has been shut firmly. We will not let them
out. There is no way they can get out," said a commander of a
reconnaissance unit.
Asked about a ceasefire, the commander replied: "We are absolutely
against it. They will have time to regroup. We have them now."
Source: Al Jazeera and agencies