I for example do not understand how it can be possible that Ukraine transports Russian gas on its pipeline network. Not sure if that's still the case though.
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Switching it off on one end would require storing it somewhere at the source and switching it off on the other could destroy the actual piping. You can't just "take" it from one and easily transfer it to another customer.
AFAIK it's the engineering but that other comment about neighhbors in Dubai is yeah