FRANKFURT - The shock waves from last week's arrest of the Russian billionaire Mikhail B. Khodorkovsky have spread widely, but not evenly, through the club of international investors. Here in Germany, Russia's largest trading partner, large-scale investors said that they remained committed to the country. That is hardly surprising, given that they have poured billions of euros into energy-distribution deals, pipeline projects and even equity investments in Russian companies. But experts say would-be investors within Europe, particularly midsize companies, are likely to shelve their plans until the legal storm surrounding Mr. Khodorkovsky and his oil company, Yukos, dies down. "This...