Russia has been accused of handing out bicycles and scooters to migrants to help them cross into Finland in a bid to destabilise Europe.
The Nordic country, which shares a 830-mile border with Russia, has since August witnessed a surge in people being allowed to cross despite not having proper documentation. Most people crossing are nationals from the Middle East and Africa without visas, according to Finland's border guard.
Finnish media reports that 300 migrants crossed from Russia last week, compared to near-zero on a normal week.
According to The Telegraph, Finnish officials say Russian authorities have been giving cheap bicycles and scooters to migrants to help facilitate their travels as people are banned from walking between Russian and Finnish checkpoints.
It comes after the Finnish government closed four of its eight eastern border crossings with Russia in recent weeks.
"Today the government has made the decision to close the Vaalimaa, Nuijamaa, Imatra and Niirala border crossing points on the land border between Finland and Russia," Mari Rantanen, the interiorminister, told reporters earlier this month.
Petteri Orpo, the prime minister, accused Russia of acting deliberately to destabilise Finland in response to its Nato adhesion earlier this year.
He said there were "various signs that entering Finland is being aided and encouraged, organised".
In April, Moscow warned it would take "countermeasures ... in tactical and strategic terms" after branding Finland's decision to join Nato as an "assault on our security".
The four crossing points that closed are the southernmost ones located in the most populated regions, with another four situated in rural areas further north remaining open.
The crossing points are closed until February 18, with asylum applications to be centralised at two of the four crossing points that will still be open.
Mr Orpo stressed that "if this situation expands to other border crossing points and becomes more difficult ... we'll take the necessary measures". He did not disclose what the next steps could be.
