The United States has not been helping Ukraine launch audacious drone strikes hundreds of miles into Russian territory, US Secretary of State Antony Blinken has said.A fire broke out at an airport in Russia’s southern Kursk region, that borders Ukraine, after a drone hit the facility, the region’s governor said on Tuesday.In a second incident, an industrial plant 50 miles from the Ukrainian border was also targeted by drones, which missed a fuel depot at the site, Russian media reported.Ukrainian officials did not formally confirm carrying out drone strikes inside Russia, and they have maintained ambiguity over previous high-profile attacks.