LONDON (Reuters) – Countries opposed to Russia’s invasion of Ukraine must double down on their support for Kyiv, including the supply of heavy weapons, tanks and aeroplanes, British Foreign Secretary Liz Truss will say on Wednesday. The biggest assault on a European state since World War Two has so far killed thousands and caused widespread destruction across Ukraine, forcing the West to rethink its approach to how it protects itself and maintains global stability. Truss, in a speech due to be delivered on Wednesday evening, will warn of the need to stop Russian President Vladimir Putin from c…