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Christian Lutz, Associated Press
Ukrainian President Petro Poroshenko delivers his speech at the Parliamentary Assembly of theCouncil of Europe in Strasbourg, eastern France, Thursday June 26, 2014. Poroshenko called on Russia to support his peace plan “with deeds, not words.” More than 300 people have been killed in eastern Ukraine in the past weeks as pro-Russian insurgents were fighting with government forces. Ukraine last Friday announced a unilateral cease-fire with the rebels.

MOSCOW — Ukrainian President Petro Poroshenko on Thursday called on Russia to support his peace plan "with deeds, not words" as a weeklong cease-fire between government troops and pro-Russian rebels is set to expire late Friday.

More than 300 people have been killed in eastern Ukraine in the past weeks as pro-Russian insurgents fought with government forces. Ukraine last Friday announced a unilateral cease-fire with the rebels. Some rebel groups said they would observe the cease-fire as well.

Even so, 18 government troops have been killed this week, Poroshenko said.

Speaking at the Parliamentary Assembly of the Council of Europe in Strasbourg on Thursday, Poroshenko called for Moscow to support his peace plan with deeds and, specifically, prevent armed separatists from crossing the Russian border into Ukraine.

"Without that, we cannot talk about peace," Poroshenko said. "Do support the peace plan with deeds, not words, because with these deeds we will stop the killing of civilians and the military who defend the sovereignty and territorial integrity of the state."

U.S. Secretary of State John Kerry, speaking in Paris, echoed Poroshenko's comments, saying "it is critical for Russia to show in the next hours, literally, that they're moving to help disarm the separatists, to encourage them to disarm."

Russian President Vladimir Putin has said he supports the plan. This week he won agreement from the upper chamber of the parliament to cancel authorization for the use of force in Ukraine.

Putin and German Chancellor Angela Merkel had a telephone conversation on Thursday, discussing "the need to extend the cease-fire" in Ukraine and release people held by armed rebels in eastern Ukraine, the Kremlin said.

Poroshenko also announced that representatives of the mutinous regions have agreed to sit down to talks with the Russian ambassador, a former Ukrainian president representing Poroshenko, and an OSCE envoy. The first round of these talks was held on Monday, bringing rebel leaders to the negotiating table for the first time.

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Angela Charlton in Paris contributed to this report.