LONDON (Reuters) - British tour operator TUI Travel (>> TUI Travel PLC) has agreed to pump millions of pounds into its Russian joint venture to help ease the impact of challenging trading conditions.

TUI Travel said on Wednesday it would invest up to 15.3 million pounds ($24.4 million) and provide a new guarantee of 3 million pounds for its TUI Russia and CIS joint venture with S-Group.

Existing guarantees and shareholder loans would be renewed, the firm added.

"Given the ongoing challenging trading environment for tour operators located in the Russian and Ukrainian source markets the above arrangements are prudent as we enter into the off-peak Winter period," it said in a statement.

Earlier this month, the firm said it was cutting the number of holidays it offers to Russian customers by 30 percent after the devaluation of the rouble prevented it from raising prices.

It also said it had made a provision of 27 million pounds in the fourth quarter against loans made by its Russian venture.

S-Group is owned and controlled by Russian businessman Alexey Mordashov, the largest shareholder of TUI AG (>> TUI AG).

TUI Travel is in the process of merging with its majority owner TUI AG to create the world's biggest leisure and tourism group.

(1 US dollar = 0.6265 British pound)

(Reporting by Neil Maidment; Editing by Mark Potter)

Stocks treated in this article : TUI AG, TUI Travel PLC