Moscow said on April 18 it had summoned the U.S., British, and Canadian ambassadors for "gross interference" in Russia's domestic affairs. The envoys, who a day earlier denounced a 25-year-sentence against Kremlin critic Vladimir Kara-Murza, were summoned for "gross interference in Russia's internal affairs and activities that do not correspond to their diplomatic status," the Foreign Ministry said in a statement carried by Russian news agencies.