The same polling organisation might also wish to ask the citizens of Russia itself what they feel about the plans of Putin and friends to move energy prices within the country towards market rates.

Simple black and white models may not be appropriate for understanding what's happening here.

Former FSU countries -- it would just be mainly Ukraine & Belarus, that Russia would want to "reintegrate" at first maybe one region of Moldovia that is Russian (Trans-Dniester), Kazahstan has oil and gas, and so does most of Central Asia, & the Baltic States are part of the EU.
That is not a huge but not a small area, Ukraine and Belarus -- about 65 million people.

I know in Ukraine, these polls have been done and the Russian population which is mainly in the East and North, also the Crimea and Odessa are in favor of further Russian reintigration, while the ethnic Ukrainians in the west and south (including the majority of Kiev and almost all of Lvov) support independence. Overall it is split with a slight majority in favor of independence.

The CIA worldfactbook has Ukraine at 77% ethnic Ukrainian but it seems to me that's high from other sources: https://www.cia.gov/cia/publications/factbook/geos/up.html#People