The two Nordic nations dropped decades of military non-alignment and applied for NATO membership in the wake of Russia's invasion of Ukraine in February 2022.
Finland become a member in 2023 and Sweden this year.
NATO said in July that a so-called Forward Land Forces (FLF) presence should be developed in Finland, which shares a 1,340-kilometre (830-mile) border with Russia.
"This kind of military presence in a NATO country requires a framework nation which plays an important role in the implementation of the concept," Finnish Defence Minister Antti Hakkanen told a press conference.
The countries said Finland had asked Sweden to manage the force.
"The Swedish government has the ambition to take the role as a framework nation for a forward land force in Finland," Hakkanen's Swedish counterpart Pal Jonson told reporters.
Jonson stressed the process was still in an "early stage" and details would be worked out inside NATO.
There would also be further consultations with the Swedish parliament, he said.
Hakkanen said details about the actual force would be clarified through planning with other NATO members, adding that the number of troops and their exact location had not yet been decided.
NATO says it currently has eight such forward presences, or "multinational battlegroups", in Eastern Europe -- in Bulgaria, Estonia, Hungary, Latvia, Lithuania, Poland, Romania and Slovakia.
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