Russia has a strong financial stake in the survival of the Assad regime. But it also opposes Western intervention on principle – particularly in the wake of NATO's Libya campaign.
Iran's President Mahmoud Ahmadinejad made his usual denunciations of the US at the Shanghai Cooperation Organization's (SCO) meeting in Kazakhstan, but Russia and China seem less interested this year.
Arab world turmoil could overshadow Vice President Biden's visit to Moscow. Medvedev is opposed establishing a no-fly zone in Libya.