Trump heads to G7 summit in France as world awaits Iran deal

Mao had also helped defeat France and U.S. forces in Vietnam, by militarily supporting Ho Chi Minh's communists that took power.

From the outset, China wasn't included when major powers gathered in 1975 at a chateau outside Paris to fix the slumping global economy, the first of what have become annual summits by the G7 club of wealthy nations to forward their interests.

Even before its opening, the summit has already drawn a flood of controversies and criticism, revealing deep divisions and unmistakable decline within the Western bloc.

President George W. Bush got chilly handshakes, but he and the other leaders worked to maintain the veneer of like-minded countries uniting to confront the perils of an unruly world.