The Russophobe Eastern Europeans will absolutely stand by the sanctions. Everything is Russia's fault, they should be made to pay instead of us buckling under their blackmail. Pro-Russian elements in those countries will be loud but are IMHO unlikely to win except maybe in Bulgaria and Hungary (where they are already in power).
Western Europe, we'll see. Germany seems the most likely to crack with their appeasement bullshit and shameless ex-politicians. Fingers crossed they don't.