Stephen Lam/StringerMOSCOW (Reuters) - Two of Microsoft's official distributors in Russia have imposed restrictions on sales of Microsoft software to more than 200 Russian companies following new U.S. sanctions, according to notifications circulated by the distributors. While much of the focus around U.S. sanctions has been on ways they are being skirted, the moves by the Russian distributors show how tougher restrictions that came into force on Nov.