Satellite images show Putin building up a substantial military presence on the Finnish border.Images obtained by Swedish broadcaster SVT show four locations have seen a significant increase in activity.NATO member Finland heavily protects its eastern border.In 2022, a border fence was erected to provide more defence against a Russian invasion.Following Finland’s accession to NATO, Kremlin officials threatened ‘military-technical response measures’.This move shows a worrying war stance being adopted by Putin on Russia’s north-east border.