"I will be in Berlin (on Monday) evening," French Foreign Minister Laurent Fabius told reporters, with his press office later adding he would be attending a four-way meeting on Ukraine, where pro-Russian separatists have waged an insurgency in the east that has left more than 6,000 dead.
A ceasefire agreed in the Belarussian capital Minsk in February appears to be largely holding in Ukraine's east, despite isolated, deadly clashes.
"There has been some progress on the ground in implementing the package of February 12 Minsk measures, despite too many violations where pulling back heavy weapons is concerned," Fabius said.
From Kiev, Ukrainian President Petro Poroshenko said the focus of the upcoming talks should be the deployment of a peacekeeping mission to monitor the country's fragile truce.
He said that while the West was initially "cautious" about his call for international peacekeepers, "everyone now sees that a peacekeeping mission is the most effective way to de-escalate the conflict".
Klimkin said the situation in the east was "very tense", pointing to the two soldiers and rebel who were killed over the past 24 hours in isolated clashes.
"We still have hundreds of hostages," Klimkin said.
One of the key points agreed in the Minsk deal was that all hostages and illegally detained prisoners must be released and exchanged on an "all-for-all" basis.
Kiev and the separatists already exchanged hundreds of prisoners of war in December.