The Russian government today claimed there are more than 100 American 'mercenaries' from a defense contracting company disguised as Ukrainian troops in the embattled former Soviet nation, a claim the American firm and top U.S. officials deny. ... The latest news relesae from Greystone, as posted on a company blog, is from September 2012, titled "New business in Russia" and simply says the company "provided executive protection services in Russia." In April 2012, the company announced it had been awarded a similar contract in the Caucasus region of Eurasia. ...