Premise: Vladimir Putin . He was Prime Minister from 1999 to 2000 , President from 2000 to 2008 , and again Prime Minister from 2008 to 2012 . During his second term as Prime Minister , he was the Chairman of the ruling United Russia Party . The 2008 Presidential election was won by Dmitry Medvedev , who appointed Putin Prime Minister , beginning what has been called a period of `` tandemocracy '' .
Hypothesis: Vladimir Putin worked as Prime Minister.
Label: ENTAILMENT