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.

Ukraine launched British-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 has covertly delivered Storm Shadow missiles to Ukraine prior to lifting policy restrictions on targeting Russian territory.