DONETSK (AFP) ― Russia on Sunday endorsed a crushing victory for Ukraine’s pro-Moscow rebel leadership at controversial polls that the EU slammed as a “new obstacle” for peace in the country’s strife-torn east.

Despite warnings from Kiev and the West not to recognize the polls, Moscow moved quickly to throw its weight behind the disputed elections, deepening the international crisis over Ukraine.

“We respect the expression of the will of the residents of southeast (Ukraine),” the foreign ministry said in a statement, cited by Russian news agencies.

“Those elected have received a mandate to resolve the practical issues of re-establishing normal life in the region.”

The lightning swift acceptance of the results looked certain to spark a diplomatic firestorm, with a fresh round of Western sanctions against the Kremlin now increasingly on the cards.

Just prior to Moscow’s announcement, the European Union’s top diplomat Federica Mogherini had already decried the separatist vote as a “new obstacle on the path to peace.”

Ukrainian President Petro Poroshenko blasted the ballot as a “farce that is being conducted under the threat of tanks and guns” and the fear is they could now spell the end for a battered two-month ceasefire between government troops and rebel fighters.

Fresh from claiming victory at the hastily arranged leadership polls that their gunmen had overseen, the emboldened rebel leadership in the two separatist enclaves appeared in little mood for more compromise.

“Ukraine does not want peace, as it claims. Obviously it is playing a double game,” top rebel Alexander Zakharchenko told journalists.

Zakharchenko, already the undisputed leader in the self-proclaimed Donetsk People’s Republic, was on some 70 percent with some half of the votes counted, rebel electoral officials said.

In neighboring Lugansk region, current insurgent supremo Igor Plotnitsky, a former Soviet army officer, was on some 63 percent with around a third of the ballots tallied, Russian media reported.

The run-up to the vote saw a spate of shelling by rebels of government positions across the conflict zone, where according to U.N. figures more than 4,000 people have died since fighting started around seven months ago.

Ukrainian authorities announced Sunday the deaths of three soldiers and seven more wounded, adding to Saturday’s toll of seven dead and at least six wounded.

Fuelling concern of fresh fighting, Kiev’s military also claimed it had detected “intensive” movement of troops and equipment from Russian territory.

The reported deployments, which would constitute a major escalation of Russian involvement, could not be verified.

AFP journalists in rebel-controlled Donetsk saw a column of about 20 trucks, some carrying heavy antiaircraft guns, heading in the direction of the government-held airport, although there was a notable drop in fighting during the polling.

The rebels ― who deny being helped by Russia, but boast an arsenal that includes anti-aircraft missiles, tanks and heavy artillery ― have threatened to expand their offensive to the Azoz Sea port city of Mariupol.

The Security Service of Ukraine said it was opening a criminal investigation into the separatist election, which it called “a power grab.”

But residents of rebel-held areas spoke of their hatred for the government in Kiev and their desire for the war to end.