European stocks add the most in 3 weeks amid US

European shares gained on Thursday rising the most in a three-week period with the regional benchmark index rebounding from the lowest level in a month amid signs that the debate about new debt ceiling in the U.S. may come to an agreement. The Stoxx 600 Index surged 1% to 308.11 as of 9:18 London time after it dropped third day in a row yesterday.