The closely coordinated steps by Washington and the European Union target Russia's cash-generating energy and defence sectors while taking aim at the overall economy by limiting Moscow's ability to raise funds in the West.
Mr Obama said these measures were needed to ensure Russian 'follow-through' on the peace plan.
EU diplomats said their 'agreement in principle on new sanctions' would be officially implemented in writing on Monday.
And Nato also approved a 'spearhead' force of several thousand soldiers that would maintain a 'continuous' presence in eastern European nations that view Mr Putin's intentions with dread.
'This decision sends a clear message - Nato protects all allies at all times,' the alliance's outgoing chief Anders Fogh Rasmussen said at the conclusion of a two-day summit in Wales.
The Kremlin accuses Nato of concocting evidence about Russia's involvement in the conflict as pretext for expanding its own presence along Russia's western frontier.
AFP reporters near the latest eastern Ukrainian hotspots said that guns that had been blazing in the early morning fell silent when both sides ordered a halt to fire on Friday at 4.00pm BST.
The peace blueprint - its initial terms unveiled by Mr Putin this week after telephone talks with his Ukrainian counterpart Petro Poroshenko - could leave separatists in effective control of a region that accounts for one-sixth of Ukraine's population and a quarter of its exports.
It was drawn up during a surge in tensions as the rebels launched a lightning counter-offensive that saw a dramatic reversal of fortunes for the Ukrainian army. Nato says the rebels were bolstered by heavily-armed elite forces from Russia.
The deal brokered by the OSCE European security body will see both sides start pulling back their units from major flashpoints and exchanging prisoners on Saturday.
Russia was also allowed to supply stricken cities with humanitarian aid that Kiev had previously opposed out of fear the convoys could be used to smuggle arms.
But the agreement leaves Mr Poroshenko exposed to charges of signing off on his government's surrender and failing on his May election promise to reunify the nation of 45 million under a single banner of building strong ties with the West.
Kiev had little room for manoeuvre. Ukrainian prime minister Arseniy Yatsenyuk said the agreement required US and EU backing because Kiev could 'not manage with Russia on our own'.
Yet Washington appears to have little appetite to get drawn in directly into the post-Soviet conflict and responded cooly to Mr Yatsenyuk's appeal.
'This obviously is a ceasefire that has to be held between Russia and Ukraine,' US state department spokeswoman Marie Harf said.
'We've obviously been in contact with the Ukrainians and other parties as well about it, but this is really something that they need to hold to themselves. This isn't about the United States; this is about them.'
The pact has done little to calm the separatist passions of insurgents who remain deeply mistrustful of the nationalist-leaning team that ousted a Russian-backed leader in February.
The fighting has killed nearly 2,800 people and sent at least half a million fleeing their homes. Dozens of towns now stand in ruin and once-powerful factories and coal mines that form the backbone of Ukraine's economy have ground to a halt.
Rebel envoy Igor Plotnitsky said only a separatist government with plans to become a formal part of Russia had the trust of locals after weeks of heavy shelling by government forces.
'[The] ceasefire does not mean a change in our goal to split from Ukraine,' Mr Plotnitsky told reporters in Minsk.
OSCE officials said the future status of the self-proclaimed rebel 'republics' in Donetsk and Lugansk were not discussed in Minsk.
A source close to the negotiations told Kiev's pro-government Ukrainska Pravda news site that the framework agreement reserves 'special status for parts of the Donetsk and Lugansk regions'.
Posted by Unknown on Saturday, September 6, 2014 - Rating: 4.5
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