I agree, not alliance. Cooperation, it would be the best.
call it as you wish- alliance, union or just good relationship based on treties between states (Slavic and of those who are historicaly close to Slavs). Only important thing is that, that close cooperation result in batter living standard in `united` countries, preservation of Slavic culture and languages, salvation of Slavs from assimilation by hostile non-Slavs, strengtening Christin values which we all share, provide real security to people in case with possible terrorist and criminal actions- establish Slavic Security Forces which would react if necesery (natural chatastrophy, attack from outside of `union`, eventual internal crisis, to prevent conflicts), etc, etc.
There is one problem with Russian attitude towards some slavic countries ;)
mark my words. Russia daffinitely evolve in possitive dirrection (no matter all confusing signals) but, fact is that NATO complicate things trying to encircle Russia. I believe, Russians won`t be problem, they would cooperate in establishment of new relations between Slavs.
We need to learn to work togather, to continue from the point where era of slavery interrupted our development (in any sense). We- Slavs, must be free.