But that, of course, was precisely the trigger for the conflict with Russia at the end of last year. A leaked Russian report last August—apparently the work of Sergei Glazyev, the Kremlin’s chief ideologist of Eurasian economic integration—called for a full-scale campaign to block Ukraine doing a deal with the European Union.

The report talked about “the threat of the erosion of free trade relations in the CIS” if Ukraine were to sign the DCFTA with Brussels.

Glazyev made the same allegations at the Yalta European Strategy summit in September last year: an EU-Ukraine free-trade deal would make Ukraine’s industry uncompetitive; it would fundamentally alter Ukraine’s trade with Russia, forcing Russia to raise tariffs to defend itself against the new economic reality to the west.

After the Yalta conference, Poroshenko parried that Ukraine was still waiting for Moscow to set out its demands, “Because Russia is our main trading partner and we want to be absolutely transparent in this process. If they think that there might be any danger to their economy, they should let us know and we should take it into account.”

Europeans argued that a DCFTA constituted the best long-term hope Ukraine had of pulling itself out of the mire. It will get good access to the world’s largest free-trade zone, growth rates will go up, and corruption will be gradually squeezed out of the system.

Two economists, Veronika Movchan and Ricardo Giucci, predict that a DCFTA could add 11.8 percent to Ukraine’s GDP.

The European Union has a good track record of proving that economic integration spreads prosperity and political stability. But it was naïve and over-bureaucratic in the way it set about implementing its Ukraine policy, in particular in its failure to engage Russia diplomatically and intellectually.

As Clifford Gaddy and Barry Ickes point out in an excellent analysis, neither Europe nor Russia can afford to carry the burden of turning around Ukraine’s economy on their own. They need to do it together.

On current trends, Poroshenko will get his free trade deal with the EU and Russia will continue to oppose it on the grounds that it undermines its national interest.

So it is time surely for a respected international organization to do a study that analyses what will be the real impact on Russia of Ukraine joining the DCFTA. Then at least this over-heated political argument can be filled out with some real economic data.