In 2020, the EU imported 13 786 PJ of natural gas, while gross available energy was 57 767 PJ, i.e. gas imports accounted for 23.9% https://ec.europa.eu/eurostat/statistics-explained/index.php...
Also in 2020, 27.2% of petroleum gas imports into the EU were from Russia. https://oec.world/en/profile/international_organization/euro...
Put together, 6.5% of gross available energy in the EU was from Russian gas.
It's not so obvious that that is a problematic level of reliance threatening the political autonomy of an entire subcontinent.
If it meant that 6.5% of the population will be left without any energy, that would be quite terrible. If it meant a 6.5% drop in GDP per capita PPP, it would be worse than the drop from 2019 to 2020, but still only throw the EU economy back to 2013 levels.
That doesn't mean it isn't worth planning ahead for the consequences of reduced energy availability, but maybe we don't need to panic, either.