European Security Membership Ukraine Summit NATO Summit Russia Collective Defense Sweden Leadership NATO-Ukraine Council Support for Ukraine Ukraine's Membership European Allies Defense Spending Expansion U.S. Commitment European Union Transatlantic Relations European Union Relations Defense Obligations Mark Rutte Security Guarantees Military Support Trump's comments Leadership Succession Membership Criteria European Defense U.S. Foreign Policy Donald Trump Secretary General Collective security alliance Military Aid Member Countries Russia's influence Accession Hungary History Canada's military spending Sweden's Membership Threats Membership Process Article 5 Member States European Unity Finland Leaders' response European Members Role of the U.S. in NATO US Relations Mechanisms of NATO Anti-NATO Stance of Trump Challenges Neutrality Ukrainian Defense Swedish Entry U.S. Allies NATO's Response to Russian Aggression Sweden's Membership Issue NATO-Ukraine Relations Secretary-General Jens Stoltenberg Senators' Delegation to the NATO Summit Helsinki Future of NATO under Trump Support Trump-proofing Membership Applications Support Measures for Ukraine Ukraine's NATO Ambitions NATO-Russia Relations Washington Summit Leadership Roles Baltic Nations Tensions Western Response to Russia Eastern European Security Viktor Orban Membership Action Plan Ukraine-Russia Conflict Role Candidates Precondition-setting European Union Responses Political Support Annual Summits Recommendations by Sen. James Risch Enlargement Asia-Pacific Relations Military Cooperation Military Strength Military Missions Unity Biden's Meeting with NATO Leaders Importance of Alliance Unity Ukraine's Membership in NATO Membership Eligibility Strengthened Partnerships Strengthening Alliances Non-Members Ratification Accession Protocols