This only addresses sales to the EU. Russia has sought and succeeded in gaining clients in other countries.
...for lower than market rates.
Like that drop in the bucket & has to add additional discount to make up for rail & truck transport* costs (petrol, not gas) deal with Pakistan?
*Routed a long way through Afghanistan - oh, goodie, what could go wrong with that?
Russia has 3 problems here:
The extent to which Russia's government and primary supporters are dependent on energy sector profits.
Lack of alternative transport. This type of infrastructure, to be cost effective, (ships, already at max capacity, and pipelines) takes several years to build.
The new sanctions cover most of the transport that exists, and not only that, they benefit Russia's clients. That last is key. Is China trying to buck the transport sanctions? Of course not!