Britain is sending tanks, drones and 800 troops to Estonia as part of the biggest military build-up on Russia's borders since the Cold War.
The soldiers will be sent to the Eastern European country and will be joined by forces from Denmark and France, according to Defense Secretary Michael Fallon.
It comes a day after Russia unveiled chilling pictures of its largest ever nuclear missile - Satan 2 - which is capable of obliterating the UK.
Yesterday, Putin also reportedly launched an RS-18 ballistic missile, understood to be a test to see if it could defeat US defense systems.
And today, 130 military centres were put on high alert in Russia and six surrounding countries for drills on the region's ability to respond to attacks from the West.
The United States hopes for binding commitments from Europe to fill four battle groups of some 4,000 troops, part of NATO's response to Russia's 2014 annexation of Crimea and concern it could try a similar tactic in Europe's ex-Soviet states.
France, Denmark, Italy and other allies are expected to join the four battle groups led by the United States, Germany, Britain and Canada to go to Poland, Lithuania, Estonia and Latvia, with forces ranging from armoured infantry to drones.
Tensions are high between Russia and the West after an escalation in posturing between President Vladimir Putin and Western leaders.
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Britain sends tanks, drones and 800 troops to Estonia