North Korea announced plans Friday to blast a satellite into space on the back of a long-range rocket, a provocative move that could jeopardize a weeks-old agreement with the U.S. exchanging food aid for nuclear concessions. The North agreed to a moratorium on long-range launches as part of the deal with Washington, but it argues that its satellite launches are part of a peaceful space program that is exempt from any international disarmament agreements. The U.S., South Korea and other critics say the rocket technology overlaps with belligerent uses and condemn the satellite program as a disguised way of testing...