CNN —A series of attacks deep inside Russia this week have raised the stakes for Moscow at a time when its war on Ukraine is faltering. Russia has said that Ukrainian drones carried out three strikes on its air bases, yet two of the targets are hundreds of miles inside Russian territory and beyond the reach of Ukraine’s declared drone arsenal. Russia said it was targeted in three separate drone attacks on Monday and Tuesday. Russia said a second drone flew to the city of Engels, around 500 miles southeast of the capital, before attacking an air base with the same name. However, they have so far refused to provide Kyiv with long-range attack drones, fearing that strikes inside Russian territory would escalate the war and draw them directly into a conflict with Russian President Vladimir Putin.

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