Ukrainian Prime Minister Arseni Yatseniuk resigned on Thursday after two parties withdrew from the governing coalition to force fresh parliamentary elections.
The erstwhile deputy premier, Volodymyr Groysman, was named acting prime minister, Interior Minister Arsen Avakov said in a Facebook post.
Shortly before that, Yatseniuk told Parliament that he was resigning after two of the three parties that - to date - had supported his government abandoned the coalition.
He justified his decision by citing the parliamentary vote against a measure to increase taxes and another bill that would have allowed half of all Ukraine's gas pipelines to be sold to foreign investors.
The right-wing nationalist Svoboda party and the Udar ("Punch") formation of former boxing champion Vitaly Klitschko announced on Thursday morning their withdrawal from the coalition to accelerate the holding of legislative elections.
Batkivshchyna, the party of Yatseniuk and billionaire former Prime Minister Yulia Timoshenko, opposes an early parliamentary ballot.
"The laws have not been passed and there is no money to pay the police, the doctor, the teacher. There's no money to buy a rifle, to be able to put fuel in the armored vehicle," said Yatseniuk, alluding to the needs of the Ukrainian army in paying for the military campaign against mainly ethnic-Russian militias in the eastern part of the country.
Groysman, 36, assumed the leadership of the government commission investigating the recent downing of the Malaysian Airlines flight with 298 people on board in a portion of eastern Ukraine controlled by the militias.
He was mayor of his home town of Vinnitsa, in east-central Ukraine, from 2006 until February, when he became deputy prime minister in the administration that took power in Kiev after the ouster of then-President Viktor Yanukovych.
Groysman does not belong to any political party. EFE