Russian President Vladimir Putin on Thursday told his UAE counterpart Mohammed bin Zayed Al Nahyan that Russia was closely monitoring the situation in Iran and wanted to discuss it with him in Kremlin talks.

The president advised Iran make a deal or "the next attack will be far worse."

Russia’s deputy foreign minister is signaling that Moscow is prepared to let New START die with no replacement, even as U.S.-brokered Ukraine talks in Abu Dhabi inch forward without a breakthrough but with an unusually positive tone.

Iran to meet UK, France and Germany in Turkey on Friday after US President Donald Trump said nuclear deal with Tehran was "getting close".

Onetime allies, the United States and Iran have seen tensions escalate repeatedly in the four decades since the Islamic Revolution.

Ukrainian, US and Russian negotiators held talks in the UAE in the first known meeting to be attended by all three countries since the war began.

Iranian military forces are prepared to "immediately" retaliate against any U.S. attack, Tehran's top diplomat warned on Wednesday, as more American military assets arrived in the region and U.S. President Donald Trump threatened to launch a new attack on the country.