US missile defense system 'a problem for Russia'

RussiaToday
December 29, 2009
Russian Prime Minister Vladmir Putin says U.S. plans for a missile defense system is the main obstacle for reaching a new deal with the U.S. on reducing Cold War nuclear arms arsenals. Does a U.S. missile defense shield in Europe upset the balance of power between Russia and the U.S., as Putin says? And how does this impact renewal of the START between the two countries, viewed as a cornerstone of nuclear security in the world. A U.S. expert weighs in.