Ukraine war latest: Russian Mangust-class vessel destroyed in Crimea, military intelligence says
Key developments on May 6: * Ukraine destroys Russian fast attack craft in occupied Crimea * Syrskyi: Russia trying to break through defenses to reach Kurakhove, Pokrovsk * Russia threatens UK military installations, equipment "in Ukraine and abroad" after Cameron's remarks * Netherlands to begin F-16 aircraft deliveries to Ukraine in autumn * Minister: Ukraine