VLADIMIR Putin has drafted in soldiers to investigate a “collapsed mountain” in a remote region of Siberia amid suggestions it may have been caused by a UFO crash-landing. Whatever the cause, the event resulted in a massive rockfall which has blocked the nearby Bureya river, and left several villages at risk of flooding. So much rock was shifted it would fill 13,600 Olympic-sized swimming pools, say experts. Meanwhile, the falling 34 million cubic metres of debris left a gash in a mountain which could swallow up all the water used if every American showered at the same time. A defence...