Ivan Krastev

The United States and Russia probably do not have common aims and dreams, but they have common worries: Both Washington and Moscow are concerned about the rise of China and are threatened by the rise of radical Islam.

As China is about adaptation, not transformation, it is unlikely to change the world dramatically should it ever assume the global driver's seat. But this does not mean that China won't exploit that world for its own purposes.

We need to have a national security that puts steel in front of our enemies. I would send weapons to Ukraine. I would work with NATO to put forces on the eastern border of Poland and the Baltic nations, and I would reinstate, put in place back in the missile defense system that we had in Poland and in the Czech Republic.