JD Vance takes on a perilous mission - could it backfire?

As the US vice-president leads peace talks with Iran, he must balance warring factions, a demanding boss and his own political future.

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"If it doesn't happen, I'm blaming JD Vance," Trump joked, drawing laughter at last week's East Room event attended by senior administration officials including the vice-president, Secretary of State Marco Rubio, and Defence Secretary Pete Hegseth. And "if it does happen," Trump added, "I'm taking full credit."

The remarks perfectly captured Vance's predicament as he leads a US delegation holding talks with Iran in Pakistan. It is the most challenging assignment of Vance's vice-presidency so far - one with a limited upside and plenty to lose if negotiations fail.

Vance's diplomatic mission to Islamabad is a political minefield. To make progress in reaching a permanent agreement to end the war, he will have to satisfy several stakeholders with competing interests, and who all distrust each other after a six-week military campaign that has engulfed the Middle East and roiled the global economy.

US allies are watching Vance closely to see how he'll perform, one European official said. Vance "needs to step into the room and deliver something," added the official, who spoke on the condition of anonymity. "Otherwise he will be diminished."