Membership Leadership Secretary-General Member States Secretary General Defense Spending Ukraine Membership Criteria Annual Summit NATO-Ukraine Relations Membership Ratification Support for Ukraine NATO Leadership Military Spending Security Guarantees Summits Ukraine Membership EU Expansion Membership Invitation Timing Longest Serving Secretary-General Comments on Ukraine Biden Administration's Concerns Summit Discussions Ukraine's Bid Mandate Extension Membership Policies United States NATO Summit in Vilnius, Lithuania High-Level Consultations NATO Membership Personnel Changes Vilnius Summit Ukraine's Membership Membership Approval Relations Public Reinforcement Ukraine Response Accession Process German Support Accession Protocols NATO Security Assurances Relations with Russia Membership Issues U.S.-U.K. Relations Kosovo Peacekeeping Assistance Approval Process Succession Planning NATO Alliances Strength and Unity Leadership Changes Ukraine-Russia Conflict Gender Equality NATO Defence Plans Turkish Opposition NATO Military Spending Target NATO-Ukraine Council NATO Summits Ukraine Membership Invitation Decision Making Summit Ukraine's Membership Bid Russia-Ukraine Conflict Accession of New Members NATO and Europe Summit Meetings Membership Expansion Membership Action Plan Defense Ministers Meeting Membership Application Process Finland's Admission German Response Controversial Issues Ukraine Membership Process European Leaders Allies' Commitments to Ukraine Challenges Membership Applications History of NATO-Russia Relations Ukraine's Role in NATO Ukraine Membership Debate Consensus Candidate Selection Membership Support Relations with the United States Allies Alliance Expansion Response to Conflict Leaders Meeting Transformation Transatlantic Relations Bilateral Talks Ukrainian Membership Alliance Meetings Transatlantic Bond Defense Agreements Support of Ukraine Potential Candidates Leadership Succession Military Alliances