Moscow's efforts to forge ties with Arab states indicate the Iranian regime's so-called ally is cooling on the relationship and pursuing others.
A tax treaty and nonstop flights are the latest moves to normalise relations between Arab countries and Israel after the signing of US-brokered normalisation agreements last year.
The IAEA says that the results of its inspection work established that nuclear contamination was present at three undeclared locations, while questions linger about a fourth site.
The latest move by Germany comes amid increasing international pressure on Hizbullah, which has been partly blamed for the political and economic crisis in Lebanon.
Iranian Foreign Minister Javad Zarif's recently leaked interview confirmed that Iran prioritises its regional presence and expansionist policies over diplomacy.
The G7 members' top diplomats reserved their strongest criticism for China, urging it to abide by its obligations under international law.
The demarcation of the maritime borders between the two countries is expected to clear the way for offshore oil and gas exploration.
The two sides discussed security and intelligence co-operation during a series of meetings following an attack on Riyadh claimed by an Iranian proxy.
Oman has maintained good ties with all regional actors and is seen by many in Yemen as an impartial and trustworthy arbiter.
Tehran once again reneges on its commitments by announcing it will start enriching uranium up to 60%, even as talks are underway to revive the 2015 nuclear deal.