On Friday, Irish voters rejected the Lisbon Treaty 53.6 to 45.6 percent. Only two out of Ireland’s 43 constituencies — Dublin South and Clare — voted in favor of the treaty. Yet the Irish population accounts for only 1 percent of the European population, and voter turnout was 40 percent (i.e., significantly below the 50.1 percent turnout that is required in most countries).

In other words, 0.2 percent of the European population risks preventing the Lisbon Treaty from entering into force. That is clearly unsustainable. ...

What are the options now? There are basically three possibilities: Sack the treaty; change the treaty and start the referendum process over; or Ireland secedes. ...

The EU was a light and an anchor for the reborn democracies of southern Europe in the 1950s and again in the 1970s, as well as to the eastern ones in the 1990s. Others in the Balkans are hoping to join soon. Ireland cannot destroy it all — but an end to the treaty will destroy it all.

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Ireland — and other possible Euroskeptic countries — must act responsibly and decide what is next.

When confronted with a similar decision, the Brits opted to stay. On the other hand, pro-European countries must act decisively. Europe was a battlefield until 65 years ago. European integration is still the most precious thing the Old Continent has.

Read more at brookings.edu.