Vladimir Putin's appointment this spring as prime minister of the symbolic "union" of Russia and Belarus was yet another example of the troubling similarities between today's Russia and the other most stable and prosperous Russian regime of the past 80 years: Leonid Brezhnev's Soviet Union in the 1970s. That economy, too, was fueled by then-record oil prices. And while there are clear differences between the two Russias, if these tendencies go unchecked, the increasingly authoritarian and economically statist country may soon face crises of the kind that became apparent under Brezhnev and contributed to the Soviet Union's demise. ...