Cap on Trident nuclear warhead stockpile to rise by more than 40%

Exclusive: Boris Johnson announcement on Tuesday will end 30 years of gradual disarmament

• Analysis: five areas of interest from leaked review

Britain is lifting the cap on the number of Trident nuclear warheads it can stockpile by more than 40%, Boris Johnson will announce on Tuesday, ending 30 years of gradual disarmament since the collapse of the Soviet Union.

The increased limit, from 180 to 260 warheads, is contained in a leaked copy of the integrated review of defence and foreign policy, seen by the Guardian. It paves the way for a controversial 10bn rearmament in response to perceived threats from Russia and China.