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A. China is North Korea's largest trading partner and supplies most of its neighbor's oil and gas, as well as about half of its foreign aid. But North Korea's fourth nuclear test signals its continuing defiance of the outside world — including China, which has long expressed displeasure with the program.
D. The United States conducted 1,032 tests since 1945, followed by the former Soviet Union with 715 tests. France conducted 198 tests, and China tested 45 warheads. Only North Korea has tested nuclear weapons in the 21st century. It is estimated the United States and Russia possess 93 percent of the world's nuclear warheads.
C. Korea was annexed by the Empire of Japan in 1910. After the Japanese surrender at the end of World War II in 1945, Korea was divided into two zones by the United States and the Soviet Union, with the north occupied by the Soviets and the south by the Americans.
B. Korean War fighting ended July 27, 1953, with the signing of an armistice that created the Korean Demilitarized Zone which is 160 miles long and 2.5 miles wide. It cuts the Korean Peninsula in half and serves as the border between the rival states.