Just because a state is pluri-national does not automatically make it settler-colonial. By the same logic you could claim China is settler-colonial, but that would be a misunderstanding of what a settler-colonial state is. The Russian Federation is not the Russian Empire. National minorities have their own republics since they were liberated by the Bolsheviks. The socialist aspect of the USSR is gone but the national autonomy of ethnic republics has remained in the structure of the Russian Federation. This does not mean that ethnic minorities never face any social injustice, and of course there is still a struggle against Great Russian chauvinism, but the USSR was not perfect in this respect either although it made great efforts to rectify such injustices wherever it could.
Just because a state is pluri-national does not automatically make it settler-colonial. By the same logic you could claim China is settler-colonial, but that would be a misunderstanding of what a settler-colonial state is. The Russian Federation is not the Russian Empire. National minorities have their own republics since they were liberated by the Bolsheviks. The socialist aspect of the USSR is gone but the national autonomy of ethnic republics has remained in the structure of the Russian Federation. This does not mean that ethnic minorities never face any social injustice, and of course there is still a struggle against Great Russian chauvinism, but the USSR was not perfect in this respect either although it made great efforts to rectify such injustices wherever it could.