Speaking in the Oval Office, Biden said he wanted to reiterate that he “fully, fully supports Sweden’s membership in Nato.”

“The bottom line is simple: Sweden is going to make our alliance stronger,” Biden said, adding he was “anxiously looking forward” to the bid being ratified.

Kristersson thanked the US president for his leadership in maintaining “transatlantic unity” during the upheaval sparked by Russia’s invasion of Ukraine. He also praised Biden’s “strong support” for Sweden’s Nato bid, which is being held up by Turkey and Hungary.

“We also do think that we have things to contribute” for Nato security, the prime minister added.

Both Finland and Sweden dropped their official military non-alignment to request Nato entry in response to Russia’s 2022 invasion of neighboring Ukraine.

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Biden sees the bloc’s expansion and its mammoth efforts to arm and support Ukraine’s forces as a strategic defeat for Moscow – and his own biggest diplomatic achievement.

But expansion of Nato requires unanimous ratification from the existing 31 members.

White House Press Secretary Karine Jean-Pierre would not say whether Biden planned to reach out directly to his counterparts in Turkey and Hungary before the Nato summit in Vilnius next week.

“He’s been pretty, pretty steadfast” on the need to approve the application, she said. “Sweden is a strong, capable defense partner that shares Nato’s values.”

In addition to discussing efforts to bolster Kyiv during its difficult counteroffensive to oust Russian troops occupying swaths of Ukraine’s east and south, the two leaders also discussed transatlantic coordination on China, climate change and emerging technologies.

Turkey refuses ‘time pressure’

Western officials had hoped to formally welcome Sweden into the bloc before next Tuesday’s summit.

Kristersson said after his meeting that he and Biden had agreed that the “Vilnius meeting in a week is certainly appropriate time for Sweden’s entry, but only Turkey can take Turkey’s decisions”.

Turkish President Recep Tayyip Erdogan, however, has frustrated Western leaders by linking approval for Sweden to demands that Stockholm crack down on members of opposition Kurdish movements, such as the Kurdistan Workers’ Party PKK, which Turkey says is a terrorist group.

Sweden says it has met those demands, but Erdogan returned to the issue on Wednesday, saying that while Stockholm had moved “in the right direction” with anti-terror legislation, the organising of public demonstrations by PKK supporters “nullifies the steps taken”.

Another flashpoint has emerged, over a protest outside a Stockholm mosque where an Iraqi man set fire to pages from the Quran.

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On Tuesday, Turkish Foreign Minister Hakan Fidan rejected making the Nato summit a deadline, saying “we never approve of the use of time pressure as a method”.

A day later Fidan spoke by phone with Secretary of State Antony Blinken, and the top American diplomat “stressed the importance of Nato unity in such a critical time and encouraged Turkey’s support for Sweden to join the Nato Alliance now,” according to a statement by State Department spokesperson Matthew Miller.

Top diplomats from Turkey and Sweden will meet on Thursday at Nato headquarters in Brussels.

The diplomatic activity comes as Ukraine is in the early phases of a long-promised push to try and liberate territories occupied by Russia.

The Biden administration is hoping success in that offensive will buoy public opinion ahead of the 2024 presidential election, where generous US aid to Ukraine may become a contentious issue.