By Alexander Cornwell RIYADH (Reuters) – Russia’s invasion of Ukraine has catapulted defence spending up the political agenda in Europe and could herald a new era of purchases led by Germany, according to weapons makers gathering at an arms fair in Saudi Arabia this week. The World Defense Show, where Europe’s Airbus, MBDA and Leonardo are exhibiting alongside nearly 600 other weapons makers, is taking place amid the largest assault on an European state in 70 years. The conflict has reignited interest in security issues after years of European defence spending cuts and fatigue following NATO f…