Yes, welcome to realpolitik. You face consequences if someone stronger than you wants you to face consequences.
Do you think Italy would ever sanction France and leave the EU, destroying their entire economy in the process, on principle?
Europe kept being dependent on Russia giving them money fueling their war of conquest in Ukraine for years, and they still do that despite the sanctions and billions of euros spent to arm Ukraine. Do you really think they are not willingly letting the shadow fleet exist? Are you really that naive?