Russia has also started to launch fake drones, without any explosives, to confuse Ukraine’s air defence units and force them to waste ammunition. Compared to missiles they are much cheaper to build, easier to fire, and designed to sap morale.

A massive drone strike rattled Moscow and its suburbs overnight into Sunday, injuring several people and temporarily halting traffic at some of Russia’s busiest airports, officials reported. Meanwhile,

Ukraine launched a drone attack on a Russian chemical plant in the western city of Tula overnight on Friday into Saturday, according to the country’s security service. Russian authorities have not acknowledged the attack.