No. Russia is a sovereign nation—the world's largest by land area at over 17 million km² (6.6 million mi²), spanning 11 time zones and home to 144+ million people.
It is a federal semi-presidential republic with Moscow as its capital and largest city. Russia's territory stretches from Eastern Europe across Northern Asia to the Pacific, encompassing immense geographic, ethnic, and climatic diversity.
While it maintains deep historical, cultural, and economic ties with former Soviet republics (many now in the CIS, CSTO, or EAEU), Russia is unequivocally an independent state—not a constituent part of any other country.