Russia Ukraine update: What is NATO, why does it worry Russia and will Finland and Sweden join | Explainer
Since Russia's invasion of Ukraine, Finland and Sweden have moved to apply for membership of the North Atlantic Treaty Organisation (NATO) military alliance, which would mark a major policy shift for the Nordic region.
NATO Secretary-General Jens Stoltenberg has said the countries could join "quickly" and that he was sure arrangements could be found for the interim period.
But Russia has repeatedly warned of "serious consequences" if Finland and Sweden join NATO, saying it would have to strengthen its land, naval and air forces in the Baltic Sea, and raised the possibility of deploying nuclear weapons in the area.
Britain has pledged to come to the aid of Sweden and Finland, including with military support, if the two Nordic nations came under attack under security deals Prime Minister Boris Johnson …
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