Most likely the networks were connected for stability reasons for peak consumption instead of trading.
Also if russia was selling below EU market prices, it meant that there was a corruption somewhere, as it doesn’t make any sense from business perspective to do so.
Russia uses its energy as a weapon to corrupt and finance specific politicians, every country has to keep as far away from them as possible even if they offer energy for free.
Source: we had the same in Ukraine, and every step in decoupling from russia is made with blood.
