TNK-BP Ltd, BP PLC's (BP, BP.LN) Russian joint venture, has decided to make BP a formal offer for its assets in Vietnam and Venezuela , a person familiar with the matter said.

TNK-BP's board, meeting in
Cyprus , gave management the go-ahead to negotiate a deal, the person said. He added that TNK-BP was also interested in buying BP's assets in Algeria , though negotiations had not yet started.

TNK-BP's chief executive Maxim Barsky said this week that the company wanted to buy BP's stake in a Vietnamese gas deposit called Block 06-1, part of the $1.3 billion Nam Con Son project offshore of
Ho Chi Minh City . BP declined to comment.

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Also Friday, Tony Hayward, BP's outgoing chief executive, took his place on the TNK-BP board for the first time. He was appointed a non-executive director of TNK-BP when it was announced he was stepping down as BP chief, to be succeeded by the American, Bob Dudley.

A source close to the Russian shareholders in TNK-BP said
Hayward had been given a "warm welcome."

BP is trying to sell as much as $30 billion of assets over the next 18 months to cover the cost of the
Gulf of Mexico oil spill. It has already raised about $10 billion, and bankers say selling the Vietnamese, Venezuelan and Algerian assets could get the company roughly halfway to its goal.

In
Algeria , BP has two large natural gas projects, In Salah, which covers seven fields in the southern Sahara desert, and in Amenas. BP also participates in the Rhourde El Baguel oil project and is exploring for oil in the Bourarhet block next to In Amenas.

In
Venezuela , BP has minority stakes in two joint ventures with state-owned Petroleos de Venezuela SA, or PdVSA, and is a partner in Petromonaga, which produces 110,000 barrels a day.

The deals would be a coup for TNK-BP, a 50-50 joint venture between BP and a group of Soviet-born billionaires, which has been keen to expand internationally.
It previously focused almost exclusively on Russia.