Finland, which dropped decades of military non-alignment to join NATO in 2023, has a 1,340-kilometre (830-mile) border with Russia.
Satellite images published in the New York Times appear to show an expansion of Russian military infrastructure near the border.
"Russia is building more infrastructure to be able to bring in more troops after the war (in Ukraine) is over," the Finnish Defence Forces told AFP.
Together with its allies, Finland is "closely monitoring and assessing Russia's activities and intentions", Defence Minister Antti Hakkanen told AFP in an email.
He said Russia's moves "to strengthen its armed forces have not come as a surprise to Finland".
Moscow has repeatedly warned Finland of repercussions since joining NATO after Russia's full-scale invasion of Ukraine in 2022.
"We have excellent capabilities to observe Russian operations. As a member of the alliance, Finland holds a strong security position," Hakkanen said.
He said Finland had a "robust national defence" based on conscription and a large reserve force.
"Our entire society has invested broadly in preparedness for all types of disruptions and crises," he added.
Defence Forces Deputy Chief of Staff for Strategy, Major General Sami Nurmi, told Finnish broadcaster Yle that Russia's buildup near the border was expected.
"That is consistent with what has been assessed. It is not a question of a mass construction effort," he told Yle.
He said the activity did not pose an immediate threat to Finland.
The Nordic country has beefed up its military investments and preparedness since joining NATO.
In April, it announced it would boost defence spending to at least three percent of GDP by 2029 and launch a reform of its defence forces to tackle the security threat.
Finland shut its border with Russia in December 2023 after the arrival of around 1,000 migrants without visas. Helsinki said the surge was orchestrated by Russia -- a claim Moscow denied.
Merz warns of Russia threat in visit to NATO's eastern flank
Vilnius (AFP) May 22, 2025 -
Chancellor Friedrich Merz warned Thursday that Russia threatened security in Europe as he visited Lithuania to mark the official formation of Germany's first permanent overseas military unit since World War II, aimed at bolstering NATO's eastern flank.
The decision to build up a 5,000-strong armoured brigade in Lithuania over the coming years came in response to Russia's full-scale invasion of Ukraine in 2022.
"There is a threat to us all from Russia," Merz told reporters in the capital Vilnius. "We are protecting ourselves against this threat -- and that is why we are here today."
The German deployment is aimed at deterring potential Russian aggression towards Lithuania and fellow Baltic countries Estonia and Latvia, former Soviet republics that have become NATO and EU members and fear they are increasingly in Moscow's crosshairs.
While Germany has joined multinational military missions, including in Afghanistan and Mali, a pacifist tradition stemming from its dark World War II history meant Berlin was generally reluctant to do more.
The establishment of a permanent brigade overseas is an unprecedented move for the Bundeswehr, as the German armed forces are known, in the post-war era.
Merz, who became chancellor this month, will participate in a ceremony in the Lithuanian capital Vilnius that officially marks the formation of the heavy combat unit, the 45th tank brigade, also known as the "Lithuania Brigade".
This will be an "important milestone on the path to the permanent stationing of a German brigade on NATO's eastern flank", deputy government spokesman Steffen Meyer said last week.
The brigade, to consist of around 4,800 troops and 200 civilian Bundeswehr employees, will be gradually deployed over the coming years and should reach full operational capability by 2027.
An advance party of around 400 Bundeswehr personnel are already in the country, according to the defence ministry.
Lithuanian President Gitanas Nauseda hailed Merz's visit as a sign of Berlin's "commitment to strengthen the deterrence and defence of our country and the entire NATO eastern flank".
- Bigger role -
Merz, who has vowed to build up Europe's "strongest conventional army" by ramping up defence spending, will be keen to use the trip to highlight that Berlin is taking on a bigger role on the international stage amid dizzying political upheavals.
US President Donald Trump has heaped pressure on fellow NATO members to increase defence spending, sparked fears about American commitment to Europe, and caused shock with his overtures to Russian President Vladimir Putin as he pushes for a Ukraine peace deal.
German Defence Minister Boris Pistorius, who joined Merz on the visit, said last month that the Lithuanian deployment "sends a strong message of solidarity and readiness".
"Germany is stepping up," he added during events to mark the 70th anniversary of Germany joining the 32-member NATO military alliance.
Lithuania, with a population of 2.8 million, borders both the Russian exclave of Kaliningrad and Moscow's ally Belarus, and the German defence ministry considers it to be "the most endangered state on NATO's eastern flank".
- Growing hostility -
There have been signs of Russia ramping up hostile activities, with Moscow frequently accused of using "hybrid warfare" tactics in the Baltic Sea.
This month a Russian spy plane was spotted in Belarus apparently attempting to observe a multinational NATO military exercise in Lithuania, news outlet Der Spiegel reported.
But Germany's troop deployment is not without its difficulties.
Some question whether the Bundeswehr, suffering from personnel and equipment shortages after years of underfunding, is prepared for what the defence ministry describes as "one of the most complex and ambitious projects" in its history.
While Germany has been seeking to channel more funds to the military, new equipment will take years to order and produce.
Meanwhile the Bundeswehr, which is aiming to boost its number of soldiers to 203,000 by 2031, has been struggling to recruit.
Parliament in January passed a law aimed at making the military a more attractive career, including more flexible working arrangements and greater financial incentives.
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