Britain is prepared to begin air strikes against jihadist extremists in Iraq following talks between David Cameron and Barack Obama, defence sources have disclosed.

The Prime Minister is expected to use a meeting of the UN General Assembly tomorrow to announce that the UK will join air strikes against the Islamic State in Iraq and the Levant (Isil).

In a bid to show his commitment to forming a coalition of nations willing to take on Isil, the Prime Minsiter is also holding talks with Hassan Rouhani, the president of Iran. They will be the first face-to-face talks between a prime minister and an Iranian president since the Iranian revolution in 1979, which saw the Shah overthrown and replaced by an Islamic republic. […]