It has been a long time since Europeans have been so united. The sanctions that EU foreign ministers are now set to impose mark a radical shift in how the EU sees Russia. Hopefully, the measures will be painful enough for the Russian elite to stop Putin from trying to absorb any more parts of Ukraine or other neighboring countries.

Even more important than the impact of sanctions on Russia are the effects that the Crimean crisis will have on the EU’s attitude toward its more immediate Eastern neighbors.

The crisis goes back to February’s ouster of former Ukrainian president Viktor Yanukovych. That made EU leaders, particularly German Chancellor Angela Merkel, recognize the inherent weakness of the EU’s European Neighborhood Policy. And it finally made European leaders aware of the depth of corruption not only in Ukraine and Russia but also in Moldova and elsewhere.

For far too long, the EU had turned a blind eye to systemic corruption and the power of oligarchs in its neighborhood. That poisonous mix has not only smothered democracy. It has also prevented the modernization of these countries’ political, social, and economic structures. It will take many years to reverse those trends.

The EU will have to use its soft power tools much more intelligently than in the past to deal with these huge issues. Allocating large sums of money to Eastern European governments or promising them closer economic and political ties to the EU amounts to plastering over the problems.

Brussels must bear that in mind as pressure mounts to allow Ukraine to sign an association accord with the EU sooner than planned. Putin’s actions in Crimea will also force the EU to decide whether to offer Ukraine or the bloc’s other Eastern neighbors the prospect of membership. That is a big change. Full accession is something that until this crisis, most EU leaders did not want to consider.

But beyond any offer of eventual EU membership, Brussels will have to work much harder than before to foster the rise of civil society movements in Eastern Europe.

The prodemocracy demonstrations that engulfed Kiev and other Ukrainian cities over the past two months showed the emergence of a new and powerful sense of civil society. It is clear that in Ukraine and elsewhere, citizens want to break through the corruption that has put a brake on the development of their societies.

Yet these movements need help—help to prolong their attention span beyond the formation of the next government, help to translate their demands into legislation, and help with the institution building needed to implement change. In all of this, the EU can provide huge support if it puts its mind to it.

Brussels urgently needs to come up with ways to help civil society movements in the EU’s neighborhood. It is these movements that Vladimir Putin fears more than any economic reprisal. It is EU soft power that holds the key to changing Eastern Europe and, over time, even Russia.