BIARRITZ: G7 leaders close their summit Monday with discussion of world problems including the fires ravaging the Amazon rainforest, but overshadowed by President Donald Trump's trade wars and questions over the group's unity.

The summit in Biarritz, a high-end surfers' paradise in southwestern France, saw a dramatic shift of focus Saturday when Iranian Foreign Minister Mohammad Javad Zarif flew in to discuss the diplomatic deadlock on Tehran's disputed nuclear program.