DENVER – The United States’ “pivot” to Asia, a process so delicately defined that even the name had to be changed to “rebalancing” to avoid any misunderstandings in Europe, now seems to have company, in the form of renewed Russian interest in the region. Russia’s own “pivot” to Asia is not new; but, in the deep freeze settling over Russia’s relations with the US and Europe, it does seem to have gained the momentum of real necessity.