US Vice President JD Vance has said in an exclusive interview with Reuters that Iran must make a meaningful reduction in its nuclear enrichment capacity to satisfy US demands and end the country’s seven-month war, even as Washington was unsure how Tehran makes decisions in negotiations.

Vance, a longtime sceptic of US involvement in foreign wars, has taken a leading role in negotiating a settlement to the conflict and brokered a provisional peace agreement in June that quickly fell apart. The war has jolted global energy markets and become a political liability for President Donald Trump and fellow Republicans ahead of November midterm elections.

Speaking on Monday after a campaign trip in Alaska, Vance said any agreement would require Iran to reduce its nuclear enrichment capacity, rather than offer assurances of future nuclear drawdowns.

“If you don’t want a nuclear weapon, then why do you need 60 per cent enriched fuel? And if you want to show commitment to not building a nuclear weapon, don’t build highly enriched fuel. That’s a very basic threshold issue,” Vance said.

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