ZURICH, June 25 (Reuters) - A Zurich court on Tuesday

upheld the judgment against four bankers convicted last year of

failing to perform due diligence in financial transactions after

helping a close friend of Vladimir Putin move millions of francs

through Swiss bank accounts.

The four former employees of the Swiss unit of Russia's

Gazprombank, had asked Zurich's high court to

overturn a conviction at a lower court last year.