Dmitry Peskov said Putin would order an "appropriate" retaliation to the sanctions, which included the expulsion of 35 diplomats.
Putin says Aleppo recapture 'very important' for Syria
In a conference call with reporters, Peskov said Moscow doubted the effectiveness of the measures as the current U.S. presidential administration was stepping down in three weeks.
In addition to the expulsions, Washington closed two Russian compounds in New York and Maryland in response to what it called a campaign of harassment by Russia against American diplomats in Moscow.
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