By Stuart Williams

ImageSINGAPORE (AFP) — President Barack Obama on Sunday won the strongest backing yet from Russian counterpart Dmitry Medvedev on the Iranian nuclear crisis as the US leader warned that Tehran was "running out of time".

Obama expressed frustration with Iran's failure to give an answer three weeks after it received a UN-brokered offer aimed at defusing the stand-off, while Medvedev suggested that even Russian patience was now wearing thin.

"Unfortunately, so far at least, Iran has been unable to say yes" to the proposal, Obama said after talks with Medvedev at the Asia-Pacific Economic Cooperation (APEC) summit in Singapore.

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