President Obama said that he’s ordered the military to further protect the interests of the U.S. and its allies in Asia amid North Korea’s aggressive military moves.

“One of the things that we have been doing is spending a lot more time positioning our missile defense systems, so that even as we try to resolve the underlying problem of nuclear development inside of North Korea, we’re also setting up a shield that can at least block the relatively low-level threats that they’re posing right now,” Obama told CBS in an interview aired Tuesday morning in response to Pyongyang’s submarine-launched ballistic missile test over the weekend.