Around 8,000 British Army troops (pictured) and dozens of tanks will take part in exercises across eastern Europe to combat Russian aggression in one of the largest deployments since the Cold War.
Two British charity workers have been captured by Russian forces in Mariupol after going to Ukraine as humanitarian relief volunteers, according to reports.
Andrew Hill, a father of four from Plymouth, appeared severely injured and bloodied with a head bandage and his left arm in a sling as he was questioned on Kremlin TV.