Sweden's ruling Social Democrat party, which has until now rejected membership of NATO, is reviewing its international security policy in the light of Russia's invasion of Ukraine, it said on Monday.
The Social Democrats, the biggest party in parliament and who form a single party, minority government, have consistently rejected calls to join NATO, arguing that military non-alignment has served the country well.
But an increasingly belligerent Russia has forced a rethink across the political spectrum in both Sweden and neighbour Finland, which is also outside the 30-member NATO alliance.