Rapunzel, Rapunzel, throw me a towel!
Russians have a great love for interacting with animals through their windows, whether that animal is a bear, a bear, or in this case, a cat. The video's uploader, Evgeny Kochetkov, writes in the description: "Таким образом наш кот Мэйсон попадает к себе домой."
Translated, this means, "Thus our cat Mason gets to his home."
That's an eerily poetic description of what the cat is doing, but we're into it. Welcome home, Mason.