Not sure if that cuts off Crimea, but it does Hungary, Slovakia and Transnistria as well as the rest of Moldova, Romania, Bulgaria and Greece.
That doesn’t been they will be gasless - the gas will instead be provided by Ukraine and imports through Greece from non-Russian sources…
https://www.reuters.com/business/ene...on-2024-01-19/
Ukraine is not going to renew the gas transit contract with the Russian company Gazprom -- Ukrainian Media
The Ukrainian Minister of Energy, German Galuschenko, told reporters there are no plans to renew or make additional agreements noting that "the network of gas pipelines passed the stress test and is now ready for life without the transit of Russian gas."