Oh please, stop talking like it was Russia who helped the Warsaw Pact countries. We've been through that many times before - you exploited them as colonies and inhibited their natural development and progress.
I remember you repeat it over and over, but your most strong argument was "if Eastern Europe would receive Marshall plan then...". As for "exploitation" - East Europe lived much better than SU, and a lot of resources for EE industry were also imported from SU. USSR helped EE to industrialize and restore economy after WW2 (I do not include Czech republic - which, let be honest, did not built their industry on their own - it was farewell gift of Austro-Hungarian Empire). Economy was not efficient - yes, but "exploitation" is a BS.
Actually, I did not mean your particular country, but there was plenty which gain a lot off Communist rule. For example, Central Asian republics which were industrialized and literated. Now their are deteriorating pretty fast (except Kazakhstan).
Stop dreaming. Belarus is poor and without natural resources, and Kazakhstan won't be happy to hand over all its natural gas to Russia. The economic strength of such a bloc would be puny compared to the EU + friendly partner countries.
Belarus is not big but we are already integrating pretty good in EU-style so why not? As for Kazakhstan - they will not manage by themselves when world will go to depression. Try to remember why Kazakhstan joined Russian Empire - there is no much choice in Central Asia.
For some reason, all these countries feel that EU offers a better deal than Russia. Why is that? Think about it.
Because they feel important. I am agree with you in this regard - Russian tzars and nobles were much more sly in this regard - they could charm those barbarian khans, knyazes and other to make them feel important. Communists were much more direct and rude, and though our modern rulers are apt learners of US tactics, they are still far from being perfect.
To win countries you should make them feel important. It is useless to say: "we will give cheap oil and gas, so your industry will be competitive in the world, you will get taxes and be able to keep a lot of jobs for your people, but you will have to support us in a political regard". In the modern world you have to say: "Join EU and become part of Europe.. and be blessed! be cool and do not worry!"
Though I agree that for Czech Republic and some other countries joining EU was smart move, but for a lot of other it was suicidal in economy sense and they did it just to "become part of Europe" having no idea about what it will really cost them.