Syria and Iran are causing great strains. Russian strategists view the turmoil in the Middle East almost exclusively in terms of a conflict between Iran, on the one hand, and Saudi Arabia and the US on the other. Syria is not only Iran's ally but also Russia's best friend in the region. Russia has friendlier relations with Iran than with Saudi Arabia. The Russian government believes that geopolitics will drive the US to use force against not only Iran but also Bashar al-Assad's regime in Syria. Most Russians believe that only ill will come of the Arab spring: the likely result in many countries, they predict, will be fundamentalist Islamist regimes backed by Saudi Arabia.
Putin is ardently opposed to any kind of humanitarian intervention in Syria. This position seems to be based partly on principle - the Russians are even more firmly attached than the Chinese to absolute state sovereignty. Their belief that the West abused the terms of UNSC Resolution 1973 to justify striking Libya has reinforced their hostility to Western intervention anywhere else. Their position is also based on realpolitik: Syria buys a lot of Russian arms, provides Russia with a naval base and helps to prevent US-Saudi dominance in the Middle East.
One subject that has fostered co-operation between Washington and Moscow is Afghanistan. Putin views the US presence in the country as a bulwark against the spread of Islamist fundamentalism. Russia and the US work together on counter-narcotics operations. But even on Afghanistan there are tensions: Moscow opposes both Washington's schemes to retain military bases after its troops depart in 2014, and its plans to encourage the Afghan economy to integrate with those of Central Asia, on the grounds that they will increase America's sway in the region. In any case, the Russians believe that once US troops leave the country, the Americans will have fewer reasons to co-operate with Moscow (though Washington still hopes that the two sides will be able to work together on counter-narcotics and counter-terrorism programmes).
In purely electoral terms, Obama is unlikely to suffer from a cooler relationship with the Russian leadership. His Republican challengers have attacked him for being soft on Russia. If Mitt Romney won the presidency, US-Russia relations would probably face a frosty period. If Obama won, though the reset of recent years would be unlikely to continue, both he and Putin would see good reasons to stop the relationship turning hostile. Russia's seat on the UNSC means that the US needs its help in tackling Iran and other problems in the Middle East. And Russia knows that stormy relations with the West could damage its efforts to modernise its economy.
Russia also wants to avoid becoming too dependent on China, a country with which it currently enjoys good relations but that it mistrusts. For the time being, however, Putin appears to view US hegemony as a bigger danger than the rise of Chinese power. As he wrote in Moskovskie Novosti, he sees the emergence of the BRICS grouping (Brazil, Russia, India, China and South Africa) as geopolitically significant. "We have to co-ordinate more closely on foreign policy matters and work together more closely at the UN. ...When BRICS is really up and running, its impact on the world economy and politics will be considerable." Whether the BRICS will ever be cohesive enough make such an impact is debatable. But Putin clearly has faith in the potential of the BRICS to constrain US power.