The longer Western sanctions isolate Russia and reduce energy supplies to European refiners. The higher energy prices will go. Even though Russian energy exports are declining, higher prices have enabled the country's state-owned oil and gas companies to double revenue, thus stabilizing the ruble and allowing financing for President Putin's military machine. 
According to The Guardian, citing a new report of shipping movements by the Centre for Research on Energy and Clean Air (CREA), Russia has reaped a whopping €62 billion from oil, gas, and coal exports since the invasion of Ukraine began.  
Russian exports to energy-stricken Europe totaled €44 billion in the last two months, compared with €140 billion for FY'21. The revenue surge comes as "Russia has continued to benefit from its stranglehold over Europe's energy supply, even while governments have frantically sought to prevent Vladimir Putin from using oil and gas as an economic weapon," CREA said.