For months there was rumor (maybe true) that North Korea was working on nuclear missiles. Few days ago North Korea successfully launched a satellite (now out of control, and God know what it is carrying). According to some measurements , if the satellite is carrying nuclear missiles it is very easy to target US or Russia. Again you can’t say if it is carrying only nuclear missiles. After the launch North Korea officials said that it was only a weather satellite. If the the satellite remains “out of control” a satellite crash can happen. In 2009 a satellite crash happend between a non-functioning Russian satellite that was launched in 1993 and an active US satellite launched in 1997.