<h1>Security guarantees sought to underpin a Ukraine peace framework amid debate over troop commitments and coalition roles.</h1> NATO defence chiefs met virtually to devise security guarantees and a possible multinational backstop force to support a Ukraine peace agreement, assessing force structure, national limits on troop commitments and operational roles; the United States' role is unresolved as US leadership has ruled out ground troop deployments, while Russia rejects NATO forces on Ukrainian territory.