On December 25, 1991, following the collapse of the Soviet Union, the republic was renamed the Russian Federation, which it remains to this day. This name and "Russia" were specified as the official state names in the April 21, 1992 amendment to the existing constitution and were retained as such in the 1993 Constitution of Russia.
Try to answer this question if possible (otherwise reply "unanswerable"): When was Russia renamed the Russian Federation?
December 25, 1991