President Volodymyr Zelensky’s ouster of his longtime tech wizard, Mykhailo Fedorov, as defense minister could halt Ukraine’s striking rise in drone and robotic warfare.

Mykhailo Fedorov pushed a clear strategy to prosecute the war

Kyiv dismissed the reformer who was making the concept of speed its defence ministry's organising principle - just as Russia begins to copy the model, and days after Europe signed…