But as the focus is all on Russia this week and on Putin's effort to reshape his neighborhood, a Kazakh (as well as a Belarusian) silence is an awkward reminder that the Eurasian Union was supposed to be a collaborative project and that the more Putin grabs the headlines, the less that is the case.

The first Russian objective has been achieved. That was to stop Ukraine and Armenia from initialing Association Agreements with the European Union at the Vilnius Eastern Partnership summit. (Moldova proved a harder nut to crack and it looks as though Moscow has more or less given up on Georgia). Even now, however, the door is still half-open for Kiev and Yerevan in the future. Three years' work has been done in each capital on those agreements and the train could be restarted quite quickly.

The second part of Putin's agenda, getting these two countries into the Customs Union, is much harder. In the case of Ukraine, President Viktor Yanukovych clearly wants to defer any decision on this for as long as possible—and the events of this week will only have deepened his determination to pursue that "neither-nor" course. Besides, Russia is almost certainly not prepared for the huge challenge of economic reintegration with a country of 45 million people.

In the Armenian case, it is far from clear what the economic rationale is of a customs union with a state which does not share a border with other members. The deal was evidently about security and politics first and trade later. The two governments have set up working groups so as to set Armenia on a fast track to the new union, but all the work so far has basically been done on a Russian-Armenian bilateral basis.

Back in October, both presidents, Nursultan Nazarbayev and Alexander Lukashenko, were much cooler about admitting Armenia than was Putin. Lukashenko publicly doubted if Armenia could join next year. A month later, he visited Baku and told his Azerbaijani hosts that he was much closer to them than to Armenia, saying "we have the same views on the world order." Nazarbayev said, "We are very cautious about admitting new members."

Now, the wily president of Kazakhstan must be looking at the scenes from the Maidan in Kiev and wondering what he has put his name to.