Trump's threats against NATO allies raise concerns.
G-Seven foreign ministers seek a resolution to the Iran conflict.
Impact on the world economy and regional stability is significant.
Briefing: Winding down or spinning out of control? Trump's mixed signals on Iran rattle traditional allies
Strategic angle: As G-Seven foreign ministers root for the offramp in the Iran war, François Picard’s panel weighs the damage done to the region, to the world economy and to transatlantic trust.