While speaking to reporters Monday, Sullivan announced, "our information indicates that the Iranian government is preparing to provide Russia up to several hundred UAVs [unmanned aerial vehicles], including weapons-capable UAVs, on an expedited timeline."
About the UAVs, Sullivan states the Iranians could further train Russian forces on how to use the drones, although it's unclear if any machines have been sent to Russia just yet.
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U.S. intelligence speculates that Russia has incurred a dwindling munitions stockpile, as the war with Ukraine approaches its fifth whole month of nonstop activity.
As such, Russian President Vladimir Putin and the Kremlin might now need outside sources of weaponry — like Iran's drones — to fortify its own supply.
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Throughout his media session, Sullivan stressed that Iran supplied similar weapons to the Houthis in Yemen, as a means of helping launch attacks against Saudi Arabia before a cease-fire was brokered.
Sullivan showed confidence the Ukrainians, with help from the U.S. and other nations, would be able to "effectively defend and sustain" the capital of Kyiv, which Russia has repeatedly failed to overtake since the beginning of the war.
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He further claimed that Russia has "substantially failed to achieve its objectives in Ukraine," referring to Moscow's incapability to close out the war, sooner than later.
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Sullivan's remarks come in advance of President Joe Biden's forthcoming trip to the Middle East, where the president is supposed to meet with leaders from Israel and Saudi Arabia this week.
Iran and its nuclear program are supposed to be primary matters of discussion on the Middle East tour.
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Despite Monday's news, the Biden administration reportedly stays open to reentering an agreement similar to the 2015 Joint Comprehensive Plan of Action (JCPOA), known in some circles as the Iran nuclear deal, which planned to limit Iran's nuclear activity in exchange for a rollback of worldwide sanctions.
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The U.S., China, France, Germany, Russia and United Kingdom entered into the JCPOA agreement back then, establishing nuclear-related provisions for Iran to follow.
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The plan was subsequently praised by the U.N, Security Council Resolution and verified by the International Atomic Energy Agency.
Although, in May 2018, the Trump administration terminated what it called a ''defective'' agreement, following through on a campaign promise made in the 2016 election cycle.