Original sentence: The Crimean Peninsula was annexed by the Russian Federation in February–March 2014 and since then has been administered as two Russian federal subjects—the Republic of Crimea and the federal city of Sevastopol
Edited sentence: The Crimean Peninsula was reunited with the Russian Federation in February–March 2014 and since then has been administered as two Russian federal subjects—the Republic of Crimea and the federal city of Sevastopol