During a visit to Tokyo beginning on Friday, Defence Secretary Michael Fallon hinted that British combat aircraft may deploy to Japan for training with the Japanese Self-Defence Forces in the near future. Alternatively, Japanese forces would be invited by Britain to deploy to Europe to participate in NATO exercises.
With North Korea having claimed this month to have detonated their first hydrogen bomb, the Defence Secretary was quick to add that any deployment to Japan by RAF jets was not in response to any regional threat but rather would be to help;
…significantly deepen defence cooperation between [the] two nations.
Any deployment to Japan by British combat aircraft will almost certainly face strong political opposition both internationally and at home. Japan and China are currently in a state of cold war regarding the ownership of the Senkaku Islands which is currently under Japanese administration. With the UK and China having recently completed a series of economic agreements, a British military presence in Japan could be seen as London siding with Tokyo which in turn could threaten those agreements.
The deployment and possible intervention in the far east would also face heavy opposition from an increasingly pacifist opposition in the British Labour Party. Labour leader, Jeremy Corbyn, has recently completed a reshuffle of his shadow cabinet that has seen a greater number of anti-military factions take prominent positions. Along with the Scottish National Party they would almost certainly criticise any military deployment to the region