The United States and Russia signed a new START Treaty on April 8, 2010, and the treaty entered into force on February 5, 2011. Many analysts, both in the United States and Russia, supported negotiations on a new treaty so that the two sides could continue to implement parts of the complex monitoring and verification regime in the 1991 START Treaty. This regime was designed to build confidence in compliance with the START and to provide transparency and cooperation during the treaty's implementation. The verification regime in the new START Treaty differs in some respects from the regime in START. These differences reflect an interest in reducing the cost and complexity of the regime, updating it to account for changes in the relationship between the United States and Russia, and tailoring it to address the monitoring and verification complexities presented by the new limits in the new treaty. The verification regime received scrutiny in both the Senate, which voted on December 22, 2010, to consent to ratification, and the public.