China's Xinhua news agency reported on 30 December that Citic and Nations Energy closed the transaction, without giving any further details.

In October, Nations Energy said it had reached a preliminary deal with Citic to sell it the 96.4% stake in Karazhanbasmunai for $1.9 billion.

However, Kazakh authorities said in November that they needed to investigate the deal to determine whether the government should use its pre-emptive right to buy the stake in Karazhanbasmunai.

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