By James Liddell A Russian oligarch has called for a nuclear strike on Ukraine in a bid to “finally end this war” following the horror attack on a Moscow music venue. A group of five men armed with machine guns and hand-held explosives slaughtered at least 93 – including children – at Crocus City Hall in Krasnogorsk on Friday evening. A volley of gunfire began at approximately 9.45pm local time as concertgoers waited like sitting ducks in the auditorium for rock band ‘Picnic’. Russian authorities – including the Spetsnaz special forces – sought to control the area, detaining the assailants, se…