With the Russian army struggling to advance in Ukraine and Ukrainian strikes increasing inside Russia, Putin is escalating his gray zone campaign against Kyiv's European allies in a bid to deprive Ukraine of vital support and rescue his faltering invasion, writes Peter Dickinson.

Ukraine increasingly contributes battlefield-tested designs and operational knowledge, while Britain can provide engineering expertise, industrial capacity, certification, capital…

It isn’t the first time the Kremlin has warned of consequences for the UK over its support for Ukraine. From arson to sabotage, Russia has been testing Britain’s defences for…