In the video, designed to brief US children on Russia's federal structure, the 85 animated Russian Federation subjects sing about being part of the country.
During a national referendum on March 16, 2014, 96.77 percent of voters in the Republic of Crimea and 95.6 percent of those casting ballots in Sevastopol voted for Crimea's reunification with Russia.
US authorities have repeatedly said that they do not recognize the vote.
Sevastopol is a separately-administered federal city (like Moscow and Saint Petersburg) located in the southwestern region of the Crimean Peninsula on the Black Sea. Kiev and most of the UN member states continue to regard Sevastopol and the neighboring Republic of Crimea as part of Ukraine.