It does as part of the Lisbon Treaty, and the obligation is binding. More here: ...

		vitali 6 months ago \| parent \| context \| favorite \| on: Zelensky leaves White House after angry meeting It does as part of the Lisbon Treaty, and the obligation is binding. More here: https://eur-lex.europa.eu/EN/legal-content/glossary/mutual-d... And I would expect the call to be answered (with the exception of the already-compromised countries).