Turkish President Recep Tayyip Erdo said for the first time that Ankara could accept Finland into Nato without its Nordic neighbour Sweden.
Erdo made comments during a televised meeting with younger voters days after Ankara suspended Nato accession talks with the two countries.
Its decision threatened to derail Nato's hopes of extending the bloc to 32 countries at a summit planned for July in Lithuanian capital Vilnius.
Finland and Sweden dropped decades of military non-alignment and applied to join the defence alliance in response to Russia's invasion of Ukraine.
The two candidates that have failed to ratify by votes in parliament are Turkey and Hungary.
Both proposals are expected to be approved by the Hungarian legislature in February.
Erdo is attempting to energise his conservative and nationalist support base by going into a tightly contested 14 May election on May 14.
Erdo's main complaint has been with Sweden's refusal to extradite dozens of suspects that Ankara links to outlawed Kurdish militants and a failed 2016 coup attempt.
He said there was a clear distinction between the positions taken by Sweden and Finland in the past few months.
We can give a different response to Finland if necessary. Sweden will be shocked when we give a different response for Finland, Erdo said.
He said Sweden should hand over the suspects sought by Ankara.
If you want to join Nato, you will return these terrorists to us, Erdo said.
Sweden has a bigger Kurdish diaspora than Finland and a more serious dispute with Ankara.
Both countries have been trying to break down Erdo's resistance through months of delicate talks.
Sweden has passed a constitutional amendment that will allow it to enact tougher anti-terror laws as required by Ankara.
After its military incursion into Syria in 2019, both nations lifted their bans on military sales to Turkey.
Ankara reacted with fury to a decision by the Swedish police to allow a protest at which a far-right extremist burned a copy of the Qur outside the Turkish embassy in Stockholm earlier this month.
Ankara has been outraged by the decision of the Swedish prosecutor to not press charges against a Kurdish support group that hung an effigy of Erdogan by its ankles outside Stockholm City Court.
Swedish officials have defended their country's acceptance of free speech, despite the fact that they condemned the protests.
The standoff between Ankara and Stockholm prompted Finnish officials to hint for the first time last week that they might be forced to seek Nato membership without Sweden.
The two nations had tried to join the bloc from the beginning.
We have to assess the situation, whether something has happened that would prevent Sweden from going ahead, Finnish foreign minister Pekka Haavisto said last Tuesday.
But Haavisto stressed that a joint accession remains the first option.