By Gabriel Stargardter EVIAN-LES-BAINS, France, June 15 (Reuters) - Leaders of the Group of Seven wealthy nations meet at a French lakeside resort on Monday shortly after the U.S. and Iran said they had reached a preliminary deal to end their war. Discussing next steps on Iran will be one of several issues the global leaders will wrestle with during the June 15-17 summit, which will also seek common ground on the war in Ukraine, tackling global economic imbalances and sourcing critical minerals outside of the dominant supplier China.