Sweden will apply to join NATO, a move that will likely anger the Kremlin, according to the Associated Press.
The move was prompted by the invasion of Ukraine by Russia, according to the AP.
The prime minister of Sweden told lawmakers that the move is a historic change in the country's security policy.
Sweden needs formal security guarantees that come with NATO membership, according to the AP.
She said that the country is working with other countries.
Russia has previously said it would end the nuclear-free Baltic if Sweden and Finland joined NATO.
The deputy chairman of Russia's Security Council said in April that there can't be any more talk of a nuclear-free Baltic.
Russia has not taken such measures until today. He said that if our hand is forced, it was not our suggestion.
The Defence Minister ofLithuania said that the threat was confusing since Russia already has.
According to The Washington Post, NATO Secretary-General Jens Stoltenberg has reassured both countries.
There is a developing story. You can check back for updates.