President Trump's decision to recognise Jerusalem as the capital of Israel may have changed the dynamics of the Middle East more than anything else in a generation. Is it a recognition that what's been tried has failed and that it's time for something new? Jerusalem means so much to three great religions - Islam, Judaism and Christianity - so the symbolism of Trump's decision is enormous for billions of people. Is he simply playing to his supporters back home - or does he have the long game in mind?
