The White house extended a warm Twitter welcome to Russian President Dmitry Medvedev with the following tweet – and retweet: Welcome to @twitter President Medvedev! RT @KremlinRussia_E: Hello everyone! I'm on Twitter, and this is my first tweet. President Medvedev (l.) meets with President Barack Obama on the sidelines of the APEC summit in Yokohama, Japan, on Nov. 14.

Dmitry Astakhov/RIA Novosti/Presidential Press Service/AP