Russian billionaire purchasing European and US bank shares

At one level, this is good news because the more the financial interests merge, the closer the ties between Russia and the West become. In theory this could help limit extreme behavior when the next hot issue comes up, as they always do. The problem is that this particular billionaire and others who are coming are so closely tied to the Kremlin. It's a clever move by the Russians who are cashing in on their oil wealth and investing in much more (long term) stable economies while they are cheap. Again, it brings benefits (not to mention desperately needed cash) though do we really want leading banks to have such close ties to the Kremlin?