Boris Johnson set to become UK PM

The file photo taken on Oct. 3, 2017 shows former British Foreign Secretary Boris Johnson walking to the stage to deliver his keynote speech on day three of the Conservative Party annual conference 2017 in Manchester, Britain. Former British Foreign Secretary and ex-mayor of London Boris Johnson was elected the leader of the ruling Conservative party on Tuesday and set to become the country's prime minister. (Xinhua/Han Yan)