We want to welcome our viewers in the United States and around the world. Im wolf blitzer. Youre in the situation room. Breaking news tonight, the United States says its ready to do whatever it takes to defend against the grave threat from north koreas rapidly expanding nuclear program. North korea claims it has the abilities to produce weapons with a higher strike power that it could use against the United States and its allies. Hillary clinton says the world must stop north koreas dangerous game. She pet with a group of experts a while ago. Clinton says the Nuclear Threats are a reminder that americans must choose a Commander In Chief that can respond with steadiness and strength. Donald trump is responding by trying to cast blame on clinton. Hes calling the nuclear test one more massive failure from a failed Secretary Of State. Also tonight, russia holds massive war games in crimea. Experts say putin is sending a message to the u. S. And the world that hes in control of krimea and f