Ahead of the nuclear summit Monday in Seoul, President Obama met with Russian President Dmitry Medvedev and discussed prospects for further nuclear reductions for both nations. Judy Woodruff discusses nuclear issues with Ploughshares Fund President Joseph Cirincione and nuclear proliferation…

With a 64 percent landslide, Vladimir Putin claimed his third term as Russia's president Sunday, prompting celebrations, protests and accusations of voting fraud. Protesters vowed to continue demonstrating until their demands for democracy are met. Margaret Warner reports from Moscow…