US President Joe Biden has offered his strong support to the leaders of Sweden and Finland as their countries bid to join the North Atlantic Treaty Organisation, saying they meet all the necessary criteria.

"They meet every NATO requirement and then some," Mr Biden told reporters.

He was speaking in the White House Rose Garden in Washington DC with Swedish Prime Minister Magdalena Andersson and Finland's President Sauli Niinistö by his side.

The Nordic countries' decision to join NATO alliance was spurred by Russia's invasion of Ukraine.

Mr Biden said the "full, total, complete backing of the United States of America" was being offered to them.

He cheered the "momentous" day, giving his strong support for the two "great democracies" to "join the strongest most powerful defensive alliance in the history of the world".

The press conference followed a further statement from Turkey reaffirming its opposition to the move.

Turkey has expressed strong opposition to including Finland and Sweden in NATO, asking Sweden to halt support for Kurdish militants it considers to be part of a terrorist group and both countries to lift their bans on some sales of arms to Turkey.

All 30 NATO members need to approve any new entrant.

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Turkish President Tayyip Erdogan said in a video posted on his Twitter account today that Turkey had told allies that it will reject Sweden and Finland's membership.

Finnish President Sauli Niinisto said that his country would address all concerns addressed by Turkey on its NATO bid and condemned "terrorism" - a key issue raised by Ankara.

"We condemn terrorism in all its forms and we are actively engaged in combating it," Mr Niinisto told reporters at the White House.

"We are open to discussing all the concerns that you may have concerning our membership in an open and constructive manner," he added, addressing Turkey.

The Biden administration is "prepared to deter and to respond" to aggression against Finland and Sweden while their applications to join NATO are being processed, White House national security adviser Jake Sullivan said.

Yesterday, Mr Sullivan said that US officials were confident Turkey's concerns can be addressed.

Mr Biden commented today, "I think we're going to be okay," on the issue.