The absence of a U.S. ambassador in Moscow ever since the beginning of the Ukraine crisis has been striking. This never happened during the Cold War, when ambassadors were the prime conduits of dialogue between the superpowers. Not so these days. Sergey Lavrov and John Kerry have met many times during the past four months, and have spoken even more often. Occasionally, the two presidents also engage in telephone diplomacy. What the absence of a resident ambassador means today is that the government responsible for such a vacancy deprives itself of day-to-day contact with senior figures in the other country, and this limits its understanding of the host nation's policies.

Initially, the lack of replacement for Michael McFaul, who left Moscow on February 21, 2014, could have been seen as a sign of Washington's disapproval of Russia's actions in Crimea and with regard to Ukraine, an unspoken addition to the sanctions package. Yet, the longer the Spaso House, the U.S. ambassador's residence in Moscow's historical Arbat district, stays unoccupied, the more punishing the situation becomes for the United States: the Russian ambassador in Washington, Sergey Kislyak, has, of course, continued working in Washington. Now, the U.S. government has taken the usual step of presenting to Moscow the candidacy of its future envoy for customary prior approval by the host country.