By Mariano Zafra, Max Hunder, Anurag Rao and Sudev Kiyada March 26 (Reuters) – The Ukraine conflict has been characterised by drone deployment of an unprecedented scale. Thousands of unmanned aerial vehicles (UAVs) have been sent into the skies above the battlefield by both sides, enabling pilots to remotely track enemy movements, guide artillery and accurately drop explosives – both nearby and hundreds of kilometres away, deep in rival territory.