The U.S. warned Iran of a planned but later canceled limited military strike after the nation downed a U.S. drone it said entered its airspace in June, an Iranian official said Sunday, according to Reuters.

“After the downing of its intruding drone, the United States told us through diplomatic intermediaries that it wanted to carry out a limited operation,” Iran’s civil defense agency chief Gholamreza Jalali told the Fars news agency, according to Reuters.

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“But Iran’s response was that we regard every operation as the beginning of a war,” Jalali added.

A day after the drone was shot down, President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE passed a message through Oman that an attack was imminent, Iranian officials told Reuters. Trump confirmed, following a New York Times report, that he initially approved the strikes before calling them off at the last minute.

The canceled operation was one of several recent salvos amid mounting tensions between the U.S. and Iran, including a recent announcement from Iran that it will increase its level of uranium enrichment beyond that permitted under the 2015 nuclear deal, which the U.S. withdrew from in 2018.

“Our level of enrichment will no longer be 3.67. We will put this commitment aside by whatever amount we feel like, by whatever amount is our necessity, our need. We will take this above 3.67,” President Hassan Rouhani said last week.

The Defense Department did not immediately respond to a request from The Hill.