Russia’s increased sense of vulnerability may be the most important result of a recent large-scale Ukrainian drone attack named Operation Spiderweb, experts tell Al Jazeera. The operation destroyed as much as a third of Russia’s strategic bomber fleet on the tarmac of four airfields deep inside Russia on June 1.

Moscow’s drone strikes have grown exponentially thanks in part to a deal with Iran to produce its Shahed drones on Russian soil. An attack overnight that focused on Kyiv killed at least 15.

Ukrainian officials say three people were killed and 13 were wounded when Russia attacked the country with waves of drones and missiles.