Prime Minister Vladimir Putin said Friday Russia needs to start work on the South Stream natural gas pipeline at the end of 2012, even as it continues talks with Ukraine about expanding the country's gas transport system as an alternate route to Europe. Any moves toward building South Stream increase pressure on Ukraine, analysts said. Kiev is pushing for cheaper gas in order to balance its budget, but in exchange for lower priced gas, Moscow is aiming to gain control of Ukraine's pipeline system
 Prime Minister Vladimir Putin said Friday Russia needs to start work on the South Stream natural gas pipeline at the end of 2012, even as it continues talks with Ukraine about expanding the country's gas transport system as an alternate route to Europe.

Any moves toward building South Stream increase pressure on Ukraine, analysts said. Kiev is pushing for cheaper gas in order to balance its budget, but in exchange for lower priced gas, Moscow is aiming to gain control of Ukraine's pipeline system.

Russia Wednesday secured approval from Turkey to build the South Stream gas pipeline across the Black Sea, removing the last major obstacle to proceed with a project that could increase Europe's dependence on Russian natural-gas supplies.

The move heats up the battle between Russia and the European Union over competing pipelines, especially the EU-backed Nabucco project, and increases pressure on Ukraine to give Moscow control of its pipeline system.

"I think that it would be desirable anyhow to start at the end of next year" with construction of South Stream, Putin told OAO Gazprom (GAZP.RS) Chief Executive Alexei Miller Friday at a meeting outside Moscow, according to Russian news agencies.

Putin also asked Miller to continue talks on setting up a "gas transportation consortium" with Ukraine. Ukraine values its gas-transport system at $20 billion, but modernizing the infrastructure could cost between EUR2 billion and EUR8 billion, Miller told Putin, according to the newswires.

Ukraine is asking for an annual discount on gas of $9 billion for letting Russian jointly manage its gas-transport system, Miller said.

Moscow and Kiev are set to resume gas talks in January.