Negotiators from Russia, Ukraine, and the United States convene Tuesday in Abu Dhabi for the third round of US-brokered trilateral talks this year, following sessions in January, February, and a Geneva meeting on February 18. The US delegation is led by Trump envoys Steve Witkoff and Jared Kushner. Russia fields Vladimir Medinsky, Deputy Foreign Minister Sergei Ryabkov, and senior military officer Yuri Zhigarlovsky. Ukraine sends Rustem Umerov, head of its Foreign Intelligence Service. Zelenskyy's pre-talks posture was deliberately muscular. In his Monday night address, he cited a battlefield report from General Mykhailo Drapatyi claiming record Russian losses and effective long-range Ukrainian strikes on Russian oil infrastructure. The framing is transparent: arrive at the table with momentum, not desperation. Moscow disputes the casualty claims. The substantive signal came not from the principals but from an anonymous US official, who said both sides had privately shown "some flexibility" on territorial exchange — the single hardest variable in this war. Russia occupies roughly 20 percent of Ukraine, including Crimea and parts of the Donbas. Ukraine wants pre-2014 borders restored; Putin wants all of Donbas. The official indicated territory would likely be the last item resolved, after a post-war security framework is settled. Security guarantees are the real architecture question. The US official floated a defense commitment modeled on NATO's Article 5 — a remarkable trial balloon given Trump's well-documented skepticism of alliance commitments. Whether this means a US bilateral guarantee, a multilateral framework, or something deliberately ambiguous enough to satisfy all three parties remains the central unknown. Europe's position is structurally humiliating. France, Germany, and the European Commission sent officials to Abu Dhabi, but Russia has explicitly excluded them from the negotiating room. Kremlin spokesman Dmitry Peskov confirmed the trilateral-only format, noting that Americans and Ukrainians each have "their own channels" to talk to Europeans. This is Moscow extracting a procedural concession: the continent most affected by the war's security consequences is a corridor presence, not a negotiating party. Trump told reporters he sees a "very strong inclination" toward ending the war and that both sides are "tired of fighting." Secretary of State Rubio offered the counterweight, saying the process has "a ways to go." Trump promised to end the war quickly upon taking office in January 2025; nearly five years after Russia's full-scale invasion of February 2022, a settlement remains elusive. The structural tension is clear: Zelenskyy needs security guarantees iron-clad enough to justify any territorial concession to his domestic audience. Putin needs territorial gains concrete enough to justify the war's costs to his. Trump needs a deal — any deal — fast enough to claim credit. These three incentive structures do not naturally converge, and the gap between private flexibility and public commitments is where negotiations either accelerate or collapse.