Ukrainian premier resigns

KIEV, Ukraine - The Ukrainian government collapsed and the popular prime minister resigned Thursday, highlighting the political gridlock gripping the country struggling with a pro-Russia insurgency, a hostile neighbor, and one of the weakest economies in Europe.

The resignation of Prime Minister Arseniy Yatsenyuk, considered a rising star in Ukrainian politics, came as U.S. officials cited evidence they said showed that Russia was firing artillery across the border into Ukrainian territory.

A pro-Europe party led by former heavyweight boxing champion Vitali Klitschko, who is currently mayor of Kiev, and a far-right party with a handful of seats withdrew from the governing coalition with the Fatherland party, causing it to fall.

In an emotional speech announcing his resignation, Yatsenyuk told lawmakers that legislative gridlock was hampering the country in areas including the war effort against separatists in the east and economic stabilization.

Politicians have 30 days to try to form a new government; if they fail, President Petro Poroshenko is likely to call elections for the fall. Those elections would probably result in major gains for pro-Europe parties and marginalize pro-Russia factions, which are highly unpopular because of Moscow's annexation of Ukraine's Crimean region in March and what many Ukrainians view as Russia's support for the separatists.

In the interim, cabinet members named Deputy Prime Minister Volodymyr Groysman acting prime minister. Groysman, 36, who has no party affiliation, is seen as an appealing alternative. He has served as mayor of the western city of Vinnytsia, where Poroshenko grew up, and was assigned as the government's point person on the crash of Malaysia Airlines Flight 17, which was shot down over eastern Ukraine last week.

Despite parliament's dysfunction, Yatsenyuk, 40, had repeatedly said he wouldn't resign.

"It was an emotional move but also a rational move," said Igor Popov, a political scientist at the Politika Analytical Center in Kiev. "Yatsenyuk realized that with the economic problems and the parliament problems, it was going to get worse for him and he would get more blame."

Yatsenyuk met with President Obama at the White House during the Crimean crisis in March, and has drawn domestic support from those who laud his populist image.

Many Ukrainians resent the fact that parliament still includes pro-Russia members who stayed on after the ouster of President Viktor Yanukovich.

The perception of disarray is likely to hurt the country at a time when leaders are trying to gain Western support for their fight against Russian President Vladimir Putin.

Poroshenko, meanwhile, reiterated his desire for a new parliament and appealed for national unity.