Saber-rattling between Tehran and Washington has increased significantly in wake of a US killing of Qassem Soleimani last week

Iranian foreign minister had planned to attend Security Council meeting in New York before tensions flared over US killing of Soleimani

Iranian foreign minister had planned trip to attend upcoming meeting before tensions flared over killing of his country's senior general

Washington no longer considers settlements illegal and vows to fight anti-Israel bias in international fora, but 3 years on, Security Council Resolution 2334 stands unchallenged

US ambassador to UN seen speaking to Iranian counterpart following Security Council gathering on nuclear deal where US warned against 'malign Iranian behavior'

Head of world body says settlements have 'no legal effect' following Trump administration announcement that it doesn't necessarily consider Israeli communities West Bank illegal

September 14 missile and drone bombardment of facilities in the kingdom's east briefly knocked out half its crude oil production

As Tehran resumes nuclear development, nations have threatened to bring case before UN Security Council and potentially initiate 'snapback' of sanctions

After UK, France, and Germany warn UN chief about Iranian delivery systems, foreign minister says now is 'decisive moment'; Gantz calls for increased sanctions on Tehran regime

Tehran also accused of proliferating ballistic missile technology in the region; Iran insists all its missile activities are legal and not nuclear-related