LONDON, Jan 17 (Reuters) - U.S. private equity firm TPG

and Russian state-owned firms Rosatom and Transneft

on Friday won their bid to block jailed tycoon

Ziyavudin Magomedov's $14 billion London lawsuit over an alleged

conspiracy to strip his assets.

Magomedov sued the companies and several others at London's

High Court, alleging his 2018 arrest on embezzlement charges

prompted a Russian state-supported scheme to strip him of his

holdings in valuable port operators.

The defendants all denied the allegations and last year

argued that the lawsuit should be thrown out, with TPG's lawyers

accusing Magomedov of concocting "preposterous allegations".

Judge Robert Bright ruled that the case should not continue,

saying in a written ruling that there was "no serious issue to

be tried" against TPG or Transneft and that any case against

Rosatom should not be heard in London.

A spokesperson for Magomedov said: "We are naturally

disappointed with the decision and intend to seek permission to

appeal."

A spokesperson for TPG said the company was "pleased to

put this baseless matter behind us".

Magomedov once controlled an empire ranging from port

logistics to oil and gas through his Summa Group conglomerate,

which he founded with his brother Magomed.

But the brothers were arrested on embezzlement and organised

crime charges in one of the most high-profile prosecutions of

its kind in years.

Magomedov was sentenced to 19 years in jail in 2022 and is

held in a penal colony in Kirov, 900 km (560 miles) east of

Moscow, according to court filings for last year's hearing.

Magomedov says the charges against him are unfounded and

unsuccessfully appealed against his conviction.