Russian officials and oligarchs often live in prosperous European nations. The EU has a lot of leverage. It could issue an ultimatum: either do this by this date (for example, release all political prisoners, including Navalny), or we, the EU, blacklist all officials and parliamentarians (belonging or supported by the ruling party United Russia), oligarchs, and members of their families (so it could amount to, probably, dozens, if not hundreds, of thousands of people).
Why doesn't the EU adopt sterner sanctions against the Kremlin?
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