But even before the peace talks opened in the Belarussian capital Minsk, renewed combat was erupting on the edge of the strategic port of Mariupol, the latest flashpoint in the conflict that has plunged East-West relations to a post Cold War low.
AFP correspondents also reported heavy bombardments overnight in Donetsk, the main rebel-held city in eastern Ukraine, further highlighting the fragility of any ceasefire deal.
The seven-point blueprint -- unveiled by Russian President Vladimir Putin this week after telephone talks with his Ukrainian opposite number Petro Poroshenko -- would require government forces to retreat from much of the industrial regions of Donetsk and Lugansk.
"The only thing we need now for peace and stability is just two main things," Poroshenko said yesterday on the sidelines of the NATO summit in Wales.
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"First, that Russia withdraw its troops; and second, to close the border. If that happens, I assure you that Ukraine (will) find a peace solution within days."
NATO leaders voiced strong support for Ukraine at a two-day meeting that has focused largely on Russia's new expansionist threat.
But Britain's foreign secretary said today the measures could be lifted in the event of a ceasefire.
"If there is a ceasefire, if it is signed and if it is then implemented, we can then look at lifting sanctions off," Philip Hammond said at the NATO summit.
Any truce deal would however leave the political status of Ukraine's economically-vital east uncertain and expose Poroshenko to charges that he had signed his government's surrender to Russian troops.