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WASHINGTON (AP) — Not until the final minutes of more than seven hours of negotiating was an agreement struck in Geneva this week to calm boiling tensions along the shared border between Russia and Ukraine.

But the deal won't be sealed until its terms are met, and patience is wearing thin as time runs out.

Skepticism that it might work deepened as pro-Russian separatists in eastern Ukraine continued to occupy government buildings in defiance of the accord. They showed no inclination to abide by its call to give up their weapons.

The U.S. and European Union say they will slap Moscow with a new round of sanctions against oligarchs and advisers to President Vladimir Putin if the separatists do not disarm and surrender the buildings by midweek.