KYIV, UKRAINE—Ukraine’s president rallied support Thursday for his plan to end fighting in the country’s east in phone calls with the Russian and German leaders, even as he condemned what Ukrainian officials called an incursion of armoured vehicles from Russia.

The Ukrainian interior minister said three tanks crossed into Ukraine along with other armoured vehicles from Russia and were attacked by military forces fighting pro-Moscow separatists.

He did not directly accuse Moscow of sending the tanks, but said it showed Russia had failed to fulfil promises to tighten border controls.

Russia has denied sending troops or weapons to Ukraine, describing Russian citizens who have joined the armed separatists as volunteers. There was no independent confirmation that the tanks had come from Russia.

In Washington, U.S. State Department spokeswoman Jen Psaki said if the military incursion was confirmed, it would be a “serious and disturbing escalation of the crisis in eastern Ukraine.”

The reported incursion followed statements earlier Thursday by Russia’s foreign minister that the separatists were ready for a ceasefire but that Kyiv had to initiate the process.

Late Thursday, an explosion shook the centre of the major eastern city of Donetsk, where the rebels have taken over a regional administration building. An AP reporter nearby heard the explosion and arrived to see a van in flames in front of the building. He saw three injured people being taken away.

The breakaway Donetsk People’s Republic said on its Twitter feed that the van was used by one of the group’s leaders, Denis Pushilin, but said he was not in the vehicle. The same tweet said four people were injured and one was in grave condition.

Ukrainian President Petro Poroshenko, who took office less than a week ago, told Russian President Vladimir Putin that it was “unacceptable” that tanks had crossed the border, according to his spokesman, Svyatoslav Tsegolko. A Kremlin statement said Poroshenko told Putin about his plan for resolving the crisis in the east, but did not say whether they discussed the tanks.

The Ukrainian president also spoke Thursday with German Chancellor Angela Merkel, following a call the previous day with U.S. Vice-President Joe Biden. Poroshenko has said he was willing to negotiate, but not with what he calls terrorists, and could offer amnesty to those who don’t have “blood on their hands.”

Interior Minister Arsen Avakov said a “column” with armoured vehicles had crossed from Russia through border control points controlled by separatists near the village of Dyakove in eastern Ukraine. Three tanks went to the town of Snizhne, about 40 kilometres from Dyakove; one remained there while the two others headed toward the town of Horlivka and were engaged by the Ukrainian military, he said. He added that part of the column was destroyed.

Avakov said the incursion had been going on for three days and took place despite Russian statements of interest in a peaceful solution and promises to increase control over the border.

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