Ukraine has reportedly deployed UK-supplied Storm Shadow missiles against Russian targets, a significant escalation given Russia’s updated nuclear doctrine. -This doctrine now allows for a nuclear response to conventional strikes on Russian soil using weapons from nuclear powers like the UK or the US.

Russia's military says it shot down two British-made Storm Shadow missiles, doesn't say where or when

French-made Storm Shadow missiles at targets inside Russia for the first time on Wednesday, according to a Russian military blog and Reuters, a day after Ukraine fired US-made ATACMS missiles into Russia.

The UK government recently supplied Ukraine with dozens more Storm Shadow cruise missiles, according to people familiar with the matter, a first under Prime Minister Keir Starmer, who has pledged continued support for the country’s war against Russia.

Sir Keir Starmer has not confirmed that the UK is supplying the precision weapons - but they are understood to have been used by Ukraine to strike targets inside Russia last week.