No building in Moscow so much says “Soviet Union” as the headquarters of Gazprom, the Russian gas monopoly. It is more foreboding than the Lubyanka, the former headquarters and torture emporium of the KGB. The romantic charm of the czarist era, epitomized by the Kremlin itself, is wholly absent. Like the state monopoly itself, the structure is gigantic, threatening and very hard to get into.

It is set back from the road, and there are layers of security a visitor has to negotiate to see an official. It is easier to get into the Kremlin, No. 10 Downing Street or the White House than it is to get into Gazprom HQ. I know because I have gotten into all of them. No wonder old KGB hand Vladimir Putin loves the gas company.

As president, and now as prime minister, Putin grew Gazprom and its oil counterpart, Rosneft, not to be normal companies but agents of political implementation. Between them, they were tasked to gobble up the pieces of Yukos when its luckless founder, Mikhail Khodorkovsky, was thrown in jail.

But even more than Rosneft, it is Gazprom that has emerged as the right hand of Russian policy in Europe.

At the moment, in the dead of winter, it is Gazprom that has cut off supplies of gas to more than 12 European countries. Ostensibly, the argument is over the price paid for gas by Ukraine, the transshipper of gas to all of Europe. But the Russian political agenda is not concealed. Putin, and the siloviki (the men of power around Putin and President Dimitry Medvedev) are angered by the defiance of former members of the Soviet Union, especially Ukraine. Despite its large Russian-speaking minority (about 40 percent) it has talked of joining NATO and the European Union–a red rag to Russia. Russia is angry at the West, in general, for trying to route new pipelines from Central Asia through Georgia, avoiding Russia. It is also mad at the West for recognizing Kosovo, and has responded by buying the Serbian gas fields.

Russian gas, which now makes up 30 percent of Europe’s need, does not look such a good idea–particularly to Germany, where pressure from the Green party led to the retreat from nuclear and the push for gas turbines. Before Germany turned its back on nuclear, it was a leader in the development of promising pebble bed technology. Now, sadly, Germany depends on Russia for nearly 40 percent of its gas supplies.

The gas crisis is worst in countries like Bulgaria, where there is very little gas storage and demand is in real time. But it is also affecting Italy and Southern Europe. Having closed their coal-fired power plants and shelved their nuclear plans, those countries now feel the full pain of the Russian bear’s embrace: gas droughts and electric shortages are leaving their populations cold and hungry in the dark.

So dependent has Europe become on Russian energy that every step to ameliorate the situation is a possible irritant to Moscow. If the pipelines bypass Russia, or the hub in Ukraine, that is a provocation. If new gas comes by ship from North Africa, that is an excuse for Russia to try and price its pipeline gas at the higher price of liquefied natural gas.

Belatedly, Britain and Finland commissioned new nuclear power plants. But Germany, whose former chancellor Gerhard Schroeder took a lucrative job with Gazprom, has chosen to increase its energy dependence on Russia.

Most observers believe that the current crisis will not last. Most likely, it will conclude with a jump in the price of gas, and some satisfaction in the Kremlin that Europe has been taught a lesson. But that lesson may have to be repeated over issues far from energy–such as the expansion of NATO and the European Union.

While the Russians appear to take some satisfaction in upsetting Western Europe, it is their Soviet-era satellites that most annoy them. Why, they wonder, can’t all of Eastern Europe remain suitably deferential, like Belarus and Armenia? Both toady to Moscow.

For the rest of Europe, the message is clear: build more gas storage, arrange more imports and diversify away from gas turbines.

For our part, we can help our friends and allies by thinking through our own actions, from the European missile shield to the willy-nilly expansion of NATO. This is a European problem. But if Europe has to make geopolitical compromises with Russia, it becomes problem for the Western alliance. That is us.