Will US withdraw from NATO before 2027?

Today, Trump has said he is "absolutely" considering leaving NATO and called it a "paper tiger." European officials are already planning for a "post-American" NATO based on Pentagon briefings setting 2027 as the target year for Europe to assume most conventional defense burden. The rhetoric and the de-facto drawdown are real. The formal treaty exit this contract requires is a different thing entirely. Article 13 of the North Atlantic Treaty requires one year's notice before withdrawal takes effect — meaning a decision made in late 2026 wouldn't complete until 2027 or 2028. The resolution criteria requires an actual formal withdrawal under Article 13, not troop drawdowns, reduced planning roles, or political distancing. That one-year notice requirement alone makes the December 31, 2026 deadline structurally difficult even if the political decision were made immediately. The 2023 law folded into the FY2024 NDAA adds the second barrier. Congress explicitly required Senate consent by two-thirds vote or an act of Congress before any president can withdraw from NATO — legislation specifically championed by Rubio and Kaine to constrain exactly this scenario. Trump has said he doesn't believe he needs congressional approval. Constitutional and statutory legal challenges would immediately follow any unilateral withdrawal attempt, creating litigation that would likely outlast the 2026 deadline regardless of how it ultimately resolved. The 2027 Pentagon deadline for Europe to assume defense burden is the analytically interesting near-term development — but it describes a planned reduction in U.S. NATO commitments, not a treaty exit. Washington can scale back planning roles, intelligence sharing, and troop deployments without triggering Article 13. That partial drawdown is the base case that market pricing is distinguishing from formal withdrawal. Bottom line: The US NATO withdrawal market is pricing the gap between Trump's rhetoric and the legal and political barriers to a formal treaty exit before a hard deadline. Low single-digit YES pricing reflects that the rhetoric is real while the specific legal mechanism required for resolution faces genuine structural obstacles that rhetoric alone doesn't overcome. Watch for any Article 13 notice filing as the only observable event that would move this contract meaningfully — without that filing, everything else is drawdown, not withdrawal.