Iran was already in talks with the United States about the fate of its nuclear programme in February
The United States and Iran said on Monday they had again traded strikes, straining an already fragile ceasefire as negotiations between the two sides have stalled.
Weeks of complicated talks marked by sharp rhetoric and occasional flare-ups of violence have not managed to reach a deal to end the war and reopen the Strait of Hormuz, which is essential to oil supplies.
Washington and Tehran have sharp differences on questions like Iranian nuclear efforts and the fighting in Lebanon, which Iran has demanded must stop as part of a broader agreement.
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