Facing an imminent Russian reinvasion of Ukraine, the European Union should ask China where it stands on this crisis.

The EU should ask that question because Russia’s threat to Ukraine undermines a core EU principle: that no European nation should attack another. Considering China’s oft-stated claim that it is an EU friend that seeks only “win-win cooperation” with the political bloc, the EU deserves to know whether its largest trade partner regards Vladimir Putin’s threat as acceptable.