US-mediated talks in Abu Dhabi have placed bilateral security guarantees for Ukraine at the center of efforts to end the Russia-Ukraine conflict, with Washington proposing arrangements modeled on NATO Articles 4 and 5 that would require Russian acceptance as part of any settlement. These discussions, which began in early November 2026, also address postwar European security architecture, territorial questions in the Donbas, and monitoring mechanisms, while noting that any US commitment would likely need Senate ratification and must deter future aggression without direct NATO membership for Kyiv. Earlier 2026 consultations produced framework ideas but left concrete terms unresolved amid competing demands on land and alliance commitments. Further rounds of diplomacy and potential congressional action before year-end remain key variables for whether a formal agreement materializes by December 31.