Explainer: After Finland joins NATO, why is Turkey making Sweden wait?
Sweden's path to NATO membership remains blocked by Turkey and Hungary as neighbour Finland officially joined the 30-member alliance on Tuesday after its application was ratified in record time.
Analysts do not expect Turkey to ratify Sweden's application until after Turkey's May 14 election at the earliest. Even then, it is unclear what would trigger a change of heart by President Tayyip Erdogan. Hungary is seen following Ankara's lead.