The threat reflects the financial pressure on Gazprom, which is being forced to focus on its essential investments in relatively short-term projects.
Gazprom agreed to buy TNK-BP's 63 per cent stake in Kovykta, a field in eastern Russia, in June last year as part of a settlement to resolve a dispute over the licence for the field.
It agreed to pay $700m-$900m for the stake, and also signed a memorandum of understanding with BP to set up a $3bn joint venture to develop projects inside and outside Russia.
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