In the past year，Britain was active in the fields of security and defence. The first was to promote the new national security strategy “Global Britain in a competitive age”，and continue to update its strategic guidelines in the fields of war，space and cyber under the guidance of this strategy. Second，in Europe，the UK responded to the conflict between Russia and Ukraine through military aid to Ukraine，economic sanctions against Russia，support for NATO inclusion of Sweden and Finland，and defence cooperation with the Baltic states. Third，the UK implemented the “Indo-Pacific tilt” by deploying the HMS Queen Elizabeth aircraft carrier strike group to the South China Sea，and signing the trilateral agreement on security cooperation between the UK，the US and Australia and the Reciprocal Access Agreement with Japan. The fourth was in the Middle East，Britain persuaded the United States and Iran to return to the Iran nuclear agreement.