An emergency funding request of $4 billion dollars sent to Congress last week shows a new interest from the Trump administration in dealing with the North Korean nuclear threat; it wants to stop nuclear weapons from flying before they even really get started, the NYT reports. This would interfere with control systems in the North or shoot them down just after liftoff.
Why it matters: Other methods of intercepting North Korean missiles only work about half the time — and that's only in test situations.