I think Poland is chosen by Europe as the advanced vanguard for reconnaissance in force, to see how serious Russia's intentions are to turn off the gas in case of non-payment. Now Europe has to pass the test of how United it is.
It's the opposite, Russia tries to test the waters.
Poland has already told Russia it will not renew its contract because it's getting the gas from Noway via the Baltic pipeline, this was known from the start of the year well before the war started:
https://warsawinstitute.org/polands-plan-challenging-russian-gas-dominance/The Yamal natural gas contract, signed in September 1996 between the Polish gas company PGNiG and the Russian energy giant Gazprom, expires on December 31th, 2022 and will not be renewed, since gas will be imported from Norway from the 1st of October, becoming more independent of the whims of the Kremlin.
So basically Russia stops deliveries to somebody who didn't want them anymore!
As for Bulgaria, it's the easiest target they could find, highly dependent and poor, with a lot of pro-Russian sentiment, if they would really want to test Europe they would cut gas to Germany, or, they would stop paying Ukraine for gas transit money!
But they know that if they go that way it's game over and there will be a lot of gas flaring happening.
Sokol is trading at 73.78 and Ural at 76.40, seems like deliveries to India and China are not happening or what?