NATO leaders are expected to announce a raft of fresh sanctions against Russia today over its actions in Ukraine, although hopes remain that a ceasefire can be forged at peace talks in Minsk on the same day.
The leaders are heading into the second and final day of a NATO summit in Newport, Wales that has been labelled the most critical since the end of the Cold War for the Western military alliance as it addresses a multitude of crises from Ukraine to Iraq to Afghanistan.
They agreed yesterday to set up new funds to help Ukraine's military effort and treat wounded soldiers in a five-month conflict that has seen more than 2,600 people killed.
EU and US officials said sanctions against Russia would be announced today in response to a major escalation of Russian military support to the rebels in eastern Ukraine in recent days.
But they added implementation could be delayed pending the ceasefire talks in Minsk.
Ukrainian President Petro Poroshenko voiced "careful optimism" about the talks, which will be attended by Russia and pro-Moscow rebels.
NATO leaders are also expected to approve plans to position troops and military equipment in Eastern Europe to reassure ex-Soviet bloc member states unnerved by Russia's recent actions in Ukraine.
"While talking about peace, Russia has not made one single step to make peace possible," NATO chief Anders Fogh Rasmussen said after Ukraine-focused talks at the leaders' summit yesterday.
"Instead of de-escalating the crisis, Russia has only deepened it," he said, adding that previous Russian statements on peace had been "a smokescreen for continued Russian destabilisation of the situation".
But Rasmussen left open the door to a seven-point peace plan put forward on Wednesday by Russian President Vladimir Putin, saying: "If we are witnessing genuine efforts for a political solution, I would welcome it".
Poroshenko said he was hopeful about the plan because the initiative had come from pro-Moscow rebel leaders in eastern Ukraine.
But he added that political talks would be a "tough challenge", warning that Ukraine's independence and territorial integrity were "not for negotiation".