While Russia and China are ready to back protest-rocked Iran under threat by US President Donald Trump, that support would diminish in the face of US military action, experts told AFP.

Iran is a significant ally to the two nuclear powers, providing drones to Russia and oil to China. But analysts told AFP the two superpowers would only offer diplomatic and economic aid to Tehran, to avoid a showdown with Washington.

"China and Russia don't want to go head-to-head with the US over Iran," said Ellie Geranmayeh, a senior policy expert for the European Council on Foreign Relations think tank.

Tehran, despite its best efforts over decades, has failed to establish a formal alliance with Moscow and Beijing, she noted.

If the United States carried out strikes on Iran, "both the Chinese and the Russians will prioritise their bilateral relationship with Washington",........

© Al Monitor