Talks about a fragile peace deal for Ukraine are under way in Paris between the foreign ministers of Russia, Ukraine, Germany and France.

The meeting at the French Foreign Ministry comes amid scattered violence and uncertainty that the accord will hold — in particular a promised withdrawal of heavy weapons from the front line.

Ukraine delayed the pullout Monday, blaming continuing attacks from separatist rebels in eastern Ukraine.

Under a peace agreement reached Feb. 12 by France, Germany, Russia and Ukraine, both sides must withdraw their heavy weapons 25 to 70 kilometers (15 to 45 miles) back to create a buffer zone.

The ministers meeting Monday in Paris are Laurent Fabius of France, Frank-Walter Steinmeier of Germany, Sergey Lavrov of Russia and Pavlo Klimkin of Ukraine.