MOSCOW (Reuters) - Russia will respond to Finland's decision to grant the United States access to its military bases, a spokesman for Russia's foreign ministry said on Wednesday.

"I can only confirm that Russia will not leave unanswered the NATO military build-up on our border, which threatens the security of the Russian Federation," Deputy Spokesman Andrei Nastasin said.

"We will also take the necessary measures, including of a military-technical nature, to counter aggressive decisions by Finland, as well as its NATO allies," he added.

The Finnish parliament on Monday approved a defence cooperation agreement with the United States that was signed in December, 2023.

The agreement opens 15 Finnish military facilities for potential use by the United States. Finland became a NATO member in 2023.

(Reporting by Dmitry Antonov; editing by Guy Faulconbridge)