Montenegro has been a member of NATO since 2017, which is almost 10 years as of June 2026.

Omissions

• The MEP did not cite a specific source for the NATO accession date. No material omission identified — the core factual claim is accurate and the temporal characterisation ('almost 10 years') is reasonable for a duration of 9 years and 11 days.

Sources

• PrimaryNATO (official press release)Montenegro became NATO's newest member on Monday (5 June 2017), upon depositing its instrument of accession to the North Atlantic Treaty with the US State Department in Washington D.C.
• PrimaryNATO (Relations with Montenegro — Archived)Montenegro joined the Alliance on 5 June 2017, when the instrument for its accession to the Washington Treaty (or the North Atlantic Treaty) was deposited in Washington D.C.