Lebanon has submitted an unprecedented formal complaint against Iran to the United Nations, accusing Tehran of violating international law, interfering in Lebanon’s sovereignty, and contributing to the country’s descent into a devastating conflict against its will, according to a diplomatic document filed with the UN Security Council and obtained by Independent Arabia.

The complaint, filed on April 21 by Lebanon’s ambassador to the United Nations, Ahmad Arafa, marks the first time in the history of Lebanese-Iranian diplomatic relations that Beirut has formally lodged a complaint against Tehran before the United Nations.

The document, addressed to UN Secretary-General António Guterres and the president of the Security Council, challenges the accuracy of Iranian accounts presented to the UN and accuses Iran’s embassy in Beirut of multiple violations of the 1961 Vienna Convention on Diplomatic Relations.

The complaint was later circulated as an official document of both the UN General Assembly and the Security Council under reference number S/2026/343.

According to the filing, Lebanon reserves the right to seek international accountability from Iran for what it described as repeated breaches of international obligations, accusing Tehran of involving Lebanon in destructive wars against the will of its constitutional institutions.

The complaint directly accuses Iranian state bodies, including the Islamic Revolutionary Guard Corps (IRGC), of carrying out unlawful actions in defiance of decisions by the Lebanese government. It says Iran’s actions contributed to a conflict that killed and wounded thousands of Lebanese citizens, displaced more than one million people, caused massive material destruction, and led to the Israeli occupation of parts of Lebanese territory and the establishment of security zones.

The filing comes amid a broader diplomatic campaign by Beirut at the United Nations. Since the outbreak of the latest conflict involving Hezbollah and Israel, Lebanon has repeatedly submitted complaints against Israel to the Security Council over alleged violations of Lebanese sovereignty. Lebanese officials said the country has filed ten complaints against Israel in the past four months alone.

Those complaints included allegations related to attacks on Red Cross workers, paramedics, and journalists, as well as Israeli statements concerning the possible annexation of Lebanese territory and accusations involving the destruction and seizure of land in southern Lebanon.

The complaint against Iran places Lebanese diplomacy in the unusual position of pursuing parallel cases against both Israel and Iran — accusing Israel of violating Lebanese sovereignty and accusing Iran of interfering in Lebanon’s internal affairs and pushing the country into a war it did not choose.

At the center of the complaint is Lebanon’s challenge to what it described as “false” Iranian claims made before the United Nations.

According to the document, Lebanon’s Foreign Ministry denied assertions made in a March 10 letter by Iran’s UN ambassador Saeed Iravani claiming that the Iranian embassy in Beirut had informed Lebanese authorities about the relocation of four Iranian diplomats from their residence to the Ramada Hotel in Beirut shortly before they were killed in an Israeli airstrike on March 7.

The Lebanese Foreign Ministry said no such coordination had taken place. It cited a later memo sent by the Iranian embassy on March 16 acknowledging that there “had not been an opportunity” to contact Lebanon’s Foreign Ministry beforehand — a statement Beirut said directly contradicted Iran’s claims at the UN.

The complaint also accused the Iranian embassy of failing to report two individuals — Ahmad Rasouli and Amir Moradi — among six Iranian diplomats killed in the strike, in violation of Article 10 of the Vienna Convention, which requires diplomatic missions to notify host countries of the appointment and status of mission staff.

Lebanon said it had twice requested an updated list of Iranian diplomatic personnel in Beirut but had received no response as of the filing date of the complaint.

The document further referenced Iranian media reports stating that the six diplomats killed were in fact members of the IRGC, noting that photographs circulated online showed them in military uniforms bearing military insignia and ranks.

Lebanon argued that such activities violated Article 41 of the Vienna Convention, which obliges diplomatic personnel to respect the laws of the host state and refrain from interfering in its internal affairs. The complaint also cited another clause prohibiting diplomatic premises from being used for activities incompatible with diplomatic functions.

The filing goes beyond procedural violations to present what Lebanese officials describe as a broader pattern of Iranian interference in Lebanon’s sovereign decision-making.

According to the complaint, the IRGC announced on March 11 that it had carried out its first coordinated military attack with Hezbollah since the outbreak of the latest war, using rockets and drones to target more than 50 sites inside Israel. The operation reportedly came one day after the Lebanese government issued a decision banning Hezbollah’s military and security activities.

The Lebanese document states that the conflict resulted in the deaths and injuries of thousands of Lebanese citizens, the displacement of more than one million people, and the destruction of dozens of towns and villages, in addition to Israel’s occupation of parts of southern Lebanon.

The complaint also cited a diplomatic dispute involving Iranian ambassador-designate Mohammad Reza Raouf Sheibani. Lebanon said Tehran had refused to comply with Beirut’s decision declaring the envoy persona non grata and ordering him to leave the country before March 29.

Lebanese authorities accused the diplomat of violating the Vienna Convention by making political statements to the media before formally presenting his credentials and by refusing to comply with the host country’s expulsion order.

Despite the strong language of the complaint, Lebanese officials and diplomats acknowledged that Beirut does not expect binding action from the Security Council against either Israel or Iran, given the veto powers held by permanent members.

Former Alternate Representative of the United States to the UN General Assembly, Walid Maalouf, said the importance of the complaints lies less in immediate legal outcomes and more in establishing Lebanon’s sovereign political position on the international stage.

He said the complaints document violations in official UN records and could strengthen Lebanon’s future negotiating position on issues including Israeli withdrawal, border demarcation, reconstruction, and reparations.

Maalouf also argued that the complaint against Iran serves a separate but complementary strategic purpose by reinforcing the Lebanese state’s position that Hezbollah operates as an Iranian proxy rather than an independent Lebanese national movement.

According to Maalouf, the dual-track legal strategy could eventually support future claims for compensation from both Israel and Iran; Israel for direct destruction caused during the war, and Iran for financing and fueling the conflict through Hezbollah.

He said the complaints form part of a broader Lebanese effort to reclaim sovereign national decision-making and secure international recognition of the damage suffered by the Lebanese population.

“Submitting a complaint to the Security Council is not necessarily about winning a vote,” Maalouf said. “It is fundamentally a diplomatic tool to establish Lebanon’s narrative before the world, document its legal position, and politically embarrass the parties it considers responsible, even in the absence of binding resolutions.”

He added that the complaint against Iran could also pave the way for future international legal action under principles of state responsibility in customary international law and the International Law Commission’s 2001 draft articles on state responsibility.