U.S. and Iran squabble over whether fighting in Lebanon violates ceasefire

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The United States and Iran are locked in a diplomatic dispute over the interpretation of an existing or potential ceasefire, specifically regarding ongoing fighting in Lebanon. Senator JD Vance stated that if Iran allows broader negotiations to collapse over the Lebanese conflict—which he asserts the U.S. never considered part of the ceasefire scope—that would be Iran decision. This disagreement underscores the extreme fragility of the ongoing, indirect negotiations between Washington and Tehran, which are aimed at de-escalating regional tensions and potentially addressing Iran nuclear program. The core 'why' lies in the complex entanglement of the Israeli-Hezbollah conflict in Lebanon, a critical proxy battleground for Iran, which Washington is striving to contain to prevent a wider conflagration in the already volatile Middle East.