I see how this is not in Russia's interest but I can't see how "select few Russian and Ukrainian oligarchs" can benefit from this situation "capturing a lot of money, mostly from Gazprom, but also from Ukrainian central authorities. " ??? If there is no gas supply how they (anyone) can benefit? I am just a dummy in this field so please explain...
 Also I have no idea what the deal Russia has with Ukraine about pipeline and transit so I do not understand how Russians can "sell gas at the Ukrainian border and let the Europeans deal with the transit".It makes sense if it's possible but on the other hand it also makes possible for Ukraine to get gas again even if they do not intend to pay for gas previously used (and this would not be just).