Minister Vitaliy
Zakharchenko said negotiations with the protesters had failed. He blamed
"radical groups" for the unrest, adding protesters had arms.
The
comments came as protesters tried to seize the energy ministry. Officials said
it was "an act of terrorism".
The interior minister said
the opposition was no longer able to control "radical forces" and was
putting civilians in danger.
"The
events of the last days in the Ukrainian capital have shown that our attempts
to solve the conflict peacefully, without recourse to a confrontation of force,
remain futile," Mr Zakharchenko said in a statement on Saturday reports GHN
based on information released by BBC.
"Our
calls have not been heeded and a truce is being violated."
He
also accused protesters of shooting a police officer and kidnapping three
others.
Meanwhile,
Energy Minister Eduard Stavytsky said around 100 activists had attempted to
take over the ministry's main building in central Kiev.
He
said the protesters left after he spoke to them, but were still blocking the
building's entrance.
"What
is taking place is a direct threat to the whole Ukrainian energy system,"
he was quoted as saying by the Reuters news agency.
Protesters
have also seized a number of government buildings in other Ukrainian cities.