Leaders at G7 summit need to challenge Trump without ganging up on him

America's allies fear US policy is risking a global recession but they have to take care not to alienate the president

The G7 summit in Kananaskis, Canada is likely to be dominated by efforts to persuade Donald Trump to dilute an America-first strategy, which world leaders fear may put the global economy into recession, and entrench the war in Gaza, Ukraine and Iran - three conflicts Trump once promised to solve.

The summit represents the first collective opportunity for western leaders to challenge Trump with the consequences of his unilateralism, but with the world on a knife-edge, the six leaders cannot risk being seen to gang up on him and spark a presidential explosion.