Putin criticises West over energy: "Russian President Vladimir Putin has accused European countries for whipping up fears over the reliability of Russian energy supplies.
Speaking after meeting German leader Angela Merkel, Mr Putin said Russia and Europe must agree 'rules of the game'.
Russian firms could seek new markets in Asia if they were not free to operate in Europe, he said in a veiled threat.
European anxieties on the issue have been growing since Russia briefly cut gas supplies to Ukraine in January.
The stoppage had a knock-on effect, hitting supplies to other European countries further down its pipeline.
Fears about Russia's supplies resurfaced in the UK recently after it emerged that Russian gas giant Gazprom was eyeing British Gas owner Centrica as a potential takeover target.
The BBC's Andrew Walker says Russia is unlikely to break any existing contracts, but firms know perfectly well there is enormous demand for their oil and gas in Asia.
The timing of Mr Putin's comments, after a meeting with the German chancellor, was unlikely to be a coincidence - the message would not go unheeded, our correspondent adds.
No coincidence
The Kremlin leader denied Moscow had any plans to restrict energy supplies to Europe - the continent was, he said, a natural and convenient partner for Russia to do business with.
In a fierce defence of his country's reliability as a supplier of energy, Mr Putin said even during the Cold War, Moscow had always fulfilled its commercial energy contracts with European states.
What are we supposed to when every day we hear the same thing? We look to other markets

Vladimir Putin

But opposition to Russian expansion in European markets could force Moscow's companies to look elsewhere, he added.
'We are being blocked to the no"