And nowhere were Russia's energy politics more icy than in the former Soviet republics and the European Union.
With the mercury falling, Ukraine was the first to see what changes 2006 would bring.
On New Year's Day, Russia cut off Ukraine's natural-gas supplies in a dispute over prices and alleged siphoning.
Cold War
Kyiv had rejected a demand by Russia's Gazprom monopoly that it more than quadruple the price it paid for Russian natural gas, from $50 to $230 per 1,000 cubic meters.
A Gazprom spokesman also claimed the cutoff was a result of Ukraine's "inclination" to extract gas from shipments destined for wealthier markets further west.
"Ukraine's refusal to accept the solution proposed by us means catastrophic consequences for Ukraine's economy and, unfortunately, for the Ukrainian people," Sergei Kupriyanov said. "We think it will be very difficult, impossible even, for the Ukrainian authorities to explain to their people the reasons for such short-sighted actions."
Gazprom's tactic quickly backfired as the chilly effects of the shutoff reached Western Europe.
With EU states in an uproar, Moscow and Kyiv hastily reached an agreement on January 4 that resumed gas shipments at a moderate temporary rate of $95 per 1,000 cubic meters.
But it left Ukraine and the rest of the Commonwealth of Independent States with a clear message: Moscow was no longer willing to subsidize its post-Soviet neighbors -- particularly those looking to break free of Russia's sphere of influence in favor of Western integration.
Who's Next?
The next countries to learn that lesson were Moldova and Georgia. Chisinau experienced a gas cutoff in the early days of 2006. And Tbilisi, overreliant on Russian gas supplies, learned the dangers of dependence when a pipeline explosion left it lacking heating fuel.
As temperatures dipped to record-low temperatures, the rhetoric of Georgian President Mikheil Saakashvili grew heated. Russia, he claimed, had orchestrated the blast to seize control of Georgia's pipeline network and punish Tbilisi for pursuing NATO and EU membership.
Russian President Vladimir Putin had his own stinging response. "So, a misfortune has happened -- yes, supplies [of gas to Georgia] have been stopped," he said. "But our specialists are working night and day in the mountains in temperatures of minus 30 degrees [Celsius] in order to restore energy supplies to Georgia. And what do we hear and see from the Georgian leadership? They just spit at us."
Over the next 12 months, such energy-related confrontations were to become a common refrain in many countries in the CIS and the former Soviet bloc.