Britain last night sent soldiers and hi-tech kit to bolster up Ukraine’s defences amidst the threat of a Russian invasion. But as well as preparing for war, the UK is also opting for jaw jaw with the Kremlin. For some, this is grounds for apoplexy, as – in the midst of arguably the most dangerous European security crisis since the end of the Cold War – Defence Secretary Ben Wallace invites his Russian counterpart, Sergei Shoigu, to visit Britain.