Poland's Prime Minister Donald Tusk said Wednesday he will call on the European Union to impose sanctions on Ukraine after deadly clashes between protesters and police.

"I will speak to the leaders of EU countries today to urge them to impose sanctions -- sanctions that would strongly affect the authors of the Ukrainian drama, personal and financial sanctions," Tusk said in an address to parliament.

"I hope that Poland's position will accelerate the EU's decision-making," he added.

"Now is the time" to slap sanctions on the figures behind the violence in Ukraine, he said. "The victims need it."

His call came after Ukrainian authorities said 25 people had been killed in the worst violence to hit Kiev since the three-month crisis began.

The United States and Europe have called on Ukrainian President Viktor Yanukovych to reopen dialogue with the opposition.

A French diplomatic source said Ukraine would top the agenda at a meeting between French President Francois Hollande and German Chancellor Angela Merkel in Paris on Wednesday.

"Ukraine will be very much at the top of the agenda" at the meeting of German and French ministers, the source said.