Nato is sending Awacs surveillance aircraft on reconnaissance flights over Poland and Romania to help monitor the crisis in Ukraine.
Nato ambassadors, acting on a recommendation from the alliance's top military commander US Air Force Gen. Philip Breedlove, gave the go-ahead to the flights today, a Nato spokesman said.
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British soldiers will join troops from some 30 countries who work in the country.
The demand comes after the Prime Minister urged a "grown up" relationship between her government and the devolved administrations.
The rapper failed to make it to London in time as he had problems with his passport.