Ukrainian drones struck deep inside Russia in an overnight attack targeting an oil facility serving a military airfield in the city of Engels, nearly 400 miles from the border, Ukraine’s military said Wednesday.

Ukraine launches British Storm Shadows in ‘largest attack on Russian military facilities’ of war - Ukrainian forces hit deep inside Russian territory with British-made missiles as Moscow vows to retal

Ukraine launched waves of long-range strikes, including its ATACMS and Storm Shadow missiles, at targets inside Russia.

Ukraine launched its "most massive" attack against Russian military and industrial facilities in a range of up to 1,100 kilometers (620 miles) overnight on Jan. 14, the General Staff of Ukraine’s Armed Forces reported.

Europe warns its airlines to stay away through next summer, as Ukraine turns skies of western Russia into a battlefield.

While the ground war in eastern Ukraine has settled into a grinding war of attrition, where Russian forces sacrifice hundreds, sometimes thousands, of troops a day, for small, incremental advances, the air war has the two sides inflicting significant losses on each other's energy sector.

Located in Saratov Oblast, over 750 kilometers from the Ukrainian border, Engels airbase is home to Russian heavy bombers.

Wednesday’s attack is not the first time Ukraine has targeted Saratov, the main city of which lies more than 600 kilometers (375 miles) from the Ukrainian border, although Russian air defenses ...

The barrage appeared to be one of the largest recent assaults in Ukraine’s campaign to damage Russia’s war machine on its home territory.

Russia's military on Tuesday said it would retaliate against Ukraine after Kyiv attacked Russian regions by firing six U.S.-made ATACMS ballistic missiles, six UK-made Storm Shadow cruise missiles and launching one of the biggest drone attacks to date.

The Ukrainian military says it struck a fuel storage depot deep inside Russia. The strike caused a huge blaze at the facility that supplies an important Russian air base.