Tensions between the United States and North Korea continue to rise, as the U.S. took proactive measures Thursday and flew some of its most advanced warplanes in bombing drills over the Korean peninsula. It was another warning after North Korea launched a mid-range ballistic missile designed to carry nuclear bombs over Japan earlier this week. The isolated nation has also threatened a nuclear strike against the U.S. territory of Guam. Experts aren’t exactly sure how many deliverable nuclear weapons North Korea possesses. The Institute for Science and International Security estimates the hermit kingdom could have between 13 and 30 nuclear weapons. However, a July 2017 report by the U.S. Defense Intelligence Agency calculated that North Korea has 60 nuclear devices, according to The Washington Post. Worldwide, there are around 14,935 warheads, according to Federation of American Scientists. Below is a map that shows the best estimates of which countries have nuclear weap...