Care to elaborate? Why exactly would EU membership for Ukraine lead to the collapse of the RF?
You missunderstood, I said that without Ukraine in Russian sphere of influence, but instead building ties with west RF would probably not last long enough to see Ukraine as the part of EU. That may be a bit overstated statement, but I try to explain scenario where this is possible:
1. As it stands right now, Ukraine would not gain EU membership any time soon. It will not surprise me, that even if they tried really hard to root out the corruption & stabilize economy & fighting will end tomorrow, with east in Ukraine hands it will take 10 years
at least. 20 or 30 years time frame is much more likely.
2. Given (1.), RF is in the long run, even with Eurasian union, in fact really weak structure. They are loosing their population rapidly due to the low birth rate. They are keeping their total numbers steady, thanks to the imigration, but this is likely to change. Predictions for 2050 are somwhere between 90-125M (today it is 145M)
3. Russian Federation has numerous problems with its federal subjects. Separatist movements do not only exist in Chechnya and Georgia, but also in Osetia, Dagestan, Abchaszia etc... Should RF be weakend by something (demographic problems, major failure in foregin policy or just relative loose of strenght compared to EU or NATO), these separatist will fight again for independence from RF, further weakening it.
Finally : Borders of RF( or Eurasian union) are too long, and too exposed to potencial attack in the future. Dragging the Ukraine into Russian sphere of influence plays key role in consolidating them. And, from Russian POW, NATO is potencial enemy, so Ukraine in NATO (or EU) is a gun pointed right on Moscow.
OFC, idea of NATO or China attacking RF is ridicolous right now, but in 30 or 40 years ? Who knows? Remeber the world in 1984/74 ? All RF can know for sure is, that having great natural resources, and not begin able to protect them properly is, from historical perspective, dangerous combination. China in 18/19th century is just one example.
So in this scenario, if RF is not able to consolidate its borders with europe, and find the way of dealing with demography, their internal economical and structural problems(one sided economy, poor quality of public education, non-inovative private sector) combined with separatist tendencies will weaken RF to extend where some countrys may start to gain more and more influence in Russia basicly turing RF into state of China in 19th century.
Just for the record, I do not believe that EU will last for another 30 or 40 years, at least not in this form.
I am not claiming this to be main reason for Putin to do, what he is doing right now, I just see it as one of the possible scenarios for Russia in next decades.
If you are interested in further disscusion, we should probably do it through messages, or start new thread if more people are intrested.