Living in London/Paris, earning well (~being affected by the sanction), having "anti-Putin opinion" yet doing nothing lacks any merit. Who else would do the actual work of changing the regime if not the locals?
What do you want them to do? Just go rot in Moscow's prisons? You clearly over-estimate the level of leverage the citizenship has over its government, even in democracies. This is not a democracy.
On that note, do you also want to sanction the Syrian refugees? They're not personally storming the presidential palace over Damascus.
On that note, do you also want to sanction the Syrian refugees? They're not personally storming the presidential palace over Damascus.