Today the President ratified a landmark nuclear arms treaty with Russia, New START. As the President said during the end of the last Congress, the treaty is "a national security imperative" as well as "a cornerstone of our relations with Russia" as we continue to work with them on everything from Iran to Afghanistan.
With the Senate having approved the treaty with a strong bipartisan vote late last year, today's signing marks a final step in the process. That process began when President Obama and President Medvedev initially signed the agreement in Prague last April, a fitting location given that one year before that President Obama had been there for a major speech commiting to seek the peace and security of a world without nuclear weapons. You can read more on the White House Blog.