"We know that Russia has done things that are very much against our interests. They've done things that require us to take punitive action against Russia. That does not mean we can't work with Russia where we have a common agenda. Russia is a permanent member of the United Nations Security Council; we need their help in isolating North Korea and their nuclear weapons violations. So, we still need to work with Russia. But Russia's done things that are contrary to our national security interest, and the US must respond to those types of activities."