Sounds like the American system - when was the last time we had a thrid party candidate win the presidency?
Or much of anything else, for that matter. Hypocrisy of the most special kind prevails when it comes to Russia. Gosh, they only have two main parties to vote for. How sad.
"The Kremlin-controlled United Russia party holds two thirds of seats in the Duma, enough to pass legislation single-handedly."
I am not aware of any efforts in the US to ban third parties or third pary candidates. The vast majority of third party candidates lose, but they are not prevented from running. Putin's Unity party is attempting to ban third parties altogether.
Or how many third party Congressmen are there? Five?
In proportional voting system the percentage tresholds are almost necessary.