The Kremlin, asked on Monday if Russia had held consultations with Iran before or after Tehran responded to a letter from U.S. President Donald Trump urging the country to negotiate a nuclear deal, said Iran formulates its own policy positions.

Warships from Iran, China and Russia kicked off their annual joint exercises in the Gulf of Oman on Monday, in a show of strengthening military ties as US President Donald Trump upends longstanding Western alliances.

As President Donald Trump makes diplomatic overtures to Moscow, Tehran, and Beijing, he appears somewhat unconcerned about the three nations' increasing military cooperation.

Russian Deputy Foreign Minister Sergei Ryabkov discussed international efforts to resolve the situation around Iran's nuclear programme with Iranian ambassador Kazem Jalali, the Russian Foreign Ministry said on Friday.

Iran, China and Russia are set to launch joint naval drills as Donald Trump says U.S. is "stronger than all of them."

The US president said he had written a letter to Iran's supreme leader before talking about "final strokes" with Tehran, but questions have been raised regarding whether Russia's potential mediation will resolve the standoff.

The Kremlin said on Wednesday that future talks between Russia and the United States would include discussions on Iran's nuclear programme, a subject it said had been "touched upon" in an initial round of U.

Keith Kellogg warns of a growing security threat from a deepening alliance between Tehran, Moscow, Beijing and Pyongyang.

Israelis are hoping that Iran hawks in the Trump administration might moderate any tendency to go easy on Tehran.

Russia’s Foreign Minister Sergei Lavrov landed in Tehran on Tuesday for talks with Iranian officials, Iranian state media reported, days after Moscow held initial talks with the U.S. just a month after Donald Trump returned to the White House.

Russia and Iran remain aligned on Tehran’s goals for its domestic nuclear program, the Russian foreign ministry said this week.