no they won't.
soviet union was much more isolated than russia is today. soviet people still didn't turn on their leaders.
china under mao was much more isolated than russia is today, chinks still didn't turn on their leaders.
north korea right now is much more isolated than russia, still nobody is turning on their leaders.
to a certain extent, iran as well.
this theory that economic pressure alone will break a countrys will to resist is completely unfounded. liberal capitalists think it works because to them the economy is the only thing in the world that matters, and they think everybody else thinks like them as well, but in reality not many people think that way.