NATO has no legal way to kick out a member
History
The founding fathers of the alliance intentionally omitted a firing mechanism to ensure that no single disagreement could shatter the western front against the Soviet Union.
When diplomats gathered in 1949 to draft the North Atlantic Treaty, they prioritized absolute unity over internal discipline. They purposefully left out any provision for expelling a member, fearing that the threat of being kicked out would make the alliance fragile and susceptible to Soviet meddling. This means that even if a nation stops contributing or actively obstructs collective goals, the other members have no legal authority to force them out.