Iran on Tuesday denounced US strikes a day earlier as a sign of "bad faith and unreliability" as negotiations continue toward a possible deal to end the US-Israeli war .
The US military has characterised Monday's strikes in southern Iran as defensive, saying targets included missile launch sites and boats placing mines, and said the US acted with "restraint" in light of the weekslong ceasefire.
Iran's foreign ministry called the strikes a violation of the ceasefire and warned that Washington would bear responsibility for "all consequences," without providing details.
"The Islamic Republic of Iran will leave no act of aggression unanswered," it added in a statement.
Iran's Revolutionary Guard on Tuesday said it had shot down and deterred drones and a fighter jet that entered its airspace, according to Iran's official Mizan news agency , which did not specify when the incident occurred.
It wasn't immediately clear what the developments would mean for negotiations. The strikes came after Iranian parliament speaker Mohammad Bagher Qalibaf went to Qatar as part of the talks, which US President Donald Trump said Monday were "proceeding nicely."
The strikes were the latest flare-up in the fragile ceasefire that began on 7 April and has largely held.
Negotiations centred in part on the Strait of Hormuz, the crucial waterway off southern Iran through which a fifth of the world's crude oil and natural gas passed before the war began with US-Israeli strikes in February. Tehran retaliated by effectively closing the strait, stranding hundreds of ships and shocking the global economy.
The Strait has become a powerful lever for Tehran in talks, joining the long-running issue of Iran's nuclear program and highly enriched uranium. Iran, in turn, wants the US to lift its military blockade of Iranian ports that began on 17 April.
The strait is also a cause for growing concern, as fertiliser supplies are badly affected for vulnerable farmers worldwide.
"What we are witnessing today is not only a geopolitical crisis, it is a systemic shock to the global agrifood system," the director-general of the UN's Food and Agriculture Organisation, Qu Dongyu, said Tuesday.
Trump has introduced a new angle in negotiations for a deal on the war, saying any agreement to end the war should include a requirement for several additional countries, including Saudi Arabia and Pakistan, to join the Abraham Accords , a series of US-brokered diplomatic, economic and security agreements aimed at normalising relations with Israel.
Israel's numerous abuses against Palestinians, including during the genocidal war on the Gaza Strip , have alienated Gulf Arab states and the wider world.