Soleimani was commander of the Quds Force, one of five branches of Iran's Islamic Revolutionary Guard Corps (IRGC), which is designated as a terrorist organization by both the United States and European Parliament.^[4][5] Soleimani was considered the second most powerful person in Iran, subordinate to Supreme Leader Ali Khamenei.^[6] Five Iraqi nationals and four other Iranian nationals were killed alongside Soleimani, including the deputy chairman of Iraq's Popular Mobilization Forces (PMF) and commander of the Iran-backed Kata'ib Hezbollah militia, Abu Mahdi al-Muhandis—a person designated as a terrorist by the U.S. and the United Arab Emirates (UAE). The Pentagon says Soleimani and his troops were "responsible for the deaths of hundreds of American and coalition service members and the wounding of thousands more."^[7]


The strike occurred during the 2019–2022 Persian Gulf crisis, which began after the U.S. withdrew from the 2015 nuclear deal with Iran in 2018, reimposed sanctions, and accused Iranian elements of fomenting a campaign to harass U.S. forces in the region in 2019. On 27 December 2019, the K-1 Air Base in Iraq, which hosts Iraqi and U.S. personnel, was attacked, killing an American contractor. The U.S. responded by launching airstrikes across Iraq and Syria, reportedly killing 25 Kata'ib Hezbollah militiamen. Days later, Shia militiamen and their supporters retaliated by attacking the U.S. embassy in the Green Zone.


U.S. officials justified the Soleimani strike saying it was necessary to stop an "imminent attack", though later clarifying the legal justification of the action as being taken "in response to an escalating series of attacks...to protect United States personnel, to deter Iran from conducting or supporting further attacks...and to end Iran's strategic escalation of attacks..."^[8] Some experts, including the United Nations special rapporteur on extrajudicial, summary or arbitrary executions, considered the assassination as a likely violation of international law as well as U.S. domestic laws. Iran called the strike an act of "state terrorism". The Iraqi government said the attack undermined its national sovereignty and considered it a breach of its bilateral security agreements with the U.S. and an act of aggression against its officials. On 5 January 2020, the Iraqi parliament passed a non-binding resolution to expel all foreign troops from its territory while, on the same day, Iran took the fifth and last step of reducing commitments to the 2015 international nuclear deal.


Soleimani's killing sharply escalated tensions between the U.S. and Iran. Iranian leaders vowed revenge, while U.S. officials said they would preemptively attack any Iran-backed paramilitary groups in Iraq that they perceived as a threat. Many in the international community reacted with concern and urged restraint and diplomacy. Five days after the airstrike, Iran launched a series of missile attacks on U.S. forces based in Iraq, the first known direct engagement between Iran and the U.S. since the naval battle precipitating the Vincennes incident on 3 July 1988. Following the shootdown of Ukraine International Airlines Flight 752—a civilian airliner—by the IRGC amidst the escalation, no additional military actions took place.^[9]