Ukraine crisis: US 'hope' as UN talks focus on truce
US Secretary of State John Kerry says the US hopes the Ukraine ceasefire deal will be implemented within "hours," the BBC reported.
But Mr Kerry said he had warned Russia's foreign minister that his country faced "further consequences" if conditions were not met.
Speaking after their meeting, Sergei Lavrov told the UN there had been "tangible progress" with the truce.
Both Ukraine and the rebels say they are withdrawing heavy weapons from the front line under the Minsk ceasefire.
But tensions remain high with continued fighting in recent days shaking a fragile ceasefire that is otherwise said to be holding.
Monitors from the OSCE security group have reported weapons movements on both sides but say it is too early to confirm a full withdrawal.