Scenes of chaos and violence outside the Russian consulate in Odessa.

The eastern Ukrainian city of Slaviansk bears testimony to the fight -- with damage lined streets in the pro-separatist stronghold.

Against this back drop, Ukrainian President Petro Poroshenko is calling for a truce.

(SOUNDBITE) (Ukrainian) UKRAINIAN PRESIDENT, PETRO POROSHENKO, SAYING:

"According to the decisions which the Ukrainian Security and Defense Council will adopt today, a ceasefire will be offered, as the start of the implementation of the peace plan of the president of Ukraine."

But it's a ceasefire with a time limit.

(SOUNDBITE) (Ukrainian) UKRAINIAN PRESIDENT, PETRO POROSHENKO, SAYING:

"I want to underline, that the time of the ceasefire will be limited. Because it will be irresponsible today to get dragged into a lasting negotiation process, because we don't need to have talks for the sake of talks."

Poroshenko says his proposals for peace include constitu