Satellite images, published in the New York Times, appear to show an expansion of military infrastructure near the Finnish border, including rows of tents, military vehicles, renovations to fighter jet shelters and construction on a previously unused helicopter base.

Nurmi said: “They are changing structures and we are seeing moderate preparations when it comes to building infrastructure close to our borders, meaning that they will, once the war in Ukraine hopefully ends, start to bring back the forces that have been fighting in Ukraine, especially land forces.”