There are three crises afflicting Europe. Two are on the borders of the EU: a warlike Russia and an imploding Middle East. The third emergency is taking place inside the EU itself — where political, economic and diplomatic tensions are mounting.

The past month has seen all three crises facing Europe intensify. The terrorist attacks in Paris heightened fears about the potential spillover of violence and religious tensions from the Middle East. Russian-backed separatists have renewed their offensive in Ukraine. And Syriza’s victory in Greece means that — for the first time since the euro crisis broke out — a radical left party has won an election in an EU country.

The problems in Russia, the Middle East and theeurozone have very different roots. But, as they worsen, they are beginning to feed on each other.