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U.S. stock futures were lower on Thursday, July 6, as tensions over North Korea escalated ahead of a meeting of world leaders in Germany.

The chance for diplomacy to deal with North Korea's recent actions are "quickly closing," U.S. ambassador Nikki Haley told a U.N. Security Council on Wednesday, July 5.

"One of our capabilities lies with our considerable military forces," she continued. "We will use them if we must, but we prefer not to have to go in that direction."

North Korea said Wednesday that its intercontinental ballistic missile, fired into Japan's Exclusive Economic Zone early Tuesday, July 4, is able to carry a large nuclear warhead. The U.S. Defense Department believes the missile could reach as far as Alaska and possibly other parts of the North American mainland.

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