Early on in his Kremlin tenure, Putin had tested, with President George W. Bush, a form of partnership suited to his view of Russian interests and prerogatives. He imagined a common front in the post-9/11 War on Terror, in return for acceptance of Russia’s special influence in the former Soviet Union, with no encroachment by NATO beyond the Baltics and no interference in Russia’s domestic politics. But this kind of transaction was never in the cards.... Obama struggled to stay connected to Putin, whose suspicions never really eased.... We managed a string of tangible accomplishments: a new nuclear-arms-reduction treaty; a military transit agreement for Afghanistan; a partnership on the Iranian nuclear issue. But the upheavals of the Arab Spring unnerved Putin; he reportedly watched the grisly video of the demise of the Libyan leader Muammar Qaddafi—caught hiding in a drainage pipe and killed by Western-backed rebels—over and over again.