DAVOS, Switzerland (Reuters) - A former big investor in Russia, who accuses the government of stealing his firms and killing his lawyer, spoiled on Thursday a Russian show in Davos meant to woo investors.

Russia's President Dmitry Medvedev speaks at the opening session of the World Economic Forum (WEF) in Davos January 26, 2011. REUTERS/Christian Hartmann

Bill Browder, who had around $4 billion (2 billion pounds) invested in Russia through his Hermitage fund, says he had to flee Russia after accusing officials of corruption and saw some of his firms being stolen from him by Interior Ministry officials.

One of his lawyers, Sergei Magnitsky, died in jail last year from what Browder says was torture.

The case has shaken investor confidence and draw criticism from Western organisations and governments. President Dmitry Medvedev ordered an investigation in the case, fired several officials but Browder says the main culprits remain unpunished.

“The president of the country called for an investigation into the people who killed my lawyer,” Browder told a panel chaired by Russia’s first deputy Prime Minister Igor Shuvalov and a hall packed with Western executives.

“One year after the investigation people who killed the lawyer have been promoted higher by state orders... My question to you, Igor, is what will prevent other investors to have the same experience after my experience in Russia,” he said at the discussion, entitled “Russia’s Next Steps to Modernisation.”

The remarks came in sharp contrast to praise for Russia from top global CEOs, including PepsiCo PEP.N and Alstom ALSO.PA.

Most CEOs, whose companies have large deals and ventures in Russia, spoke in very gentle terms about the need for increased transparency and barely mentioned corruption and the rule of law, often named by other investors as Russia’s main problems.

“The government is doing everything possible to encourage foreign investors,” said the CEO of PepsiCo, Indra Nooyi, praising Prime Minister Vladimir Putin for a speedy blessing of PepsiCo’s latest acquisition in Russia in late 2010, which she said was granted within hours.

Shuvalov, who is seen as a liberal Russian politician took more than five minutes to answer Browder’s questions but his remarks seemed addressed more to the audience than to Browder himself.

“We know this case very well... Twenty people were fired immediately... It was not a case which was forgotten the next day,” he said in English.

“Unfortunately, I don’t know the results of the investigation and the end of the case... The past is always very important, although not always positive, but we need to concentrate on the future,” he added.

“You have to acknowledge the country is changing for the better. If every year we can say that the rule of law is becoming better, not perfect but better, then I think I’m doing my job,” he added. “We need to work together”