britain already has more than 800 troops in estonia as part of nato�*s response to reassure allies after russia's invasion of crimea in 2014. now borisjohnson says he is considering doubling that number in the baltic state and sending more military hardware, including long—range artillery rockets, to bolster the defences on nato�*s eastern flank. rafjets based in cyprus could fly nato air policing missions over bulgaria and romania. tensions have already been rising in the black sea, where last summer, hms defender was harassed by russian ships and aircraft. the royal navy could send warships to patrol these waters and the eastern mediterranean, though details have still to be worked out and approved by nato allies. borisjohnson, seen here visiting the british battle group in estonia, says increasing the uk's military presence will send a clear message to moscow.