Europe on war-footing: Britain sends tanks, drones and 800 troops to Estonia as part of the biggest military build-up on Russia's borders since the Cold War - as Putin practises for nuclear war with test launch of a new missile.
- Britain is preparing to send up to 800 troops to Estonia in the spring.
- Drones and Challenger 2 tanks to be sent for 'reassurance and deterrence'
- Comes as Russia completed nuclear drills for 40 million of its citizens
- NATO wants allies to contribute to its biggest military build-up on Russia's borders since the Cold War
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