Once Kaspersky discovered that the code its antivirus software detected on the NSA worker's machine were not malicious programs but source code in development by the U.S. government for its hacking operations, CEO Eugene Kaspersky says he ordered workers to delete the code. Given the potential for abuse, and Russia's adversarial relationship with the U.S., the government has deemed Kaspersky software a risk, though officials have never provided evidence that Kaspersky or the Russian government used its software to spy on customers. For years before Kaspersky began selling software in the U.S. its code was embedded in software and hardware appliances of other companies – cybersecurity firm F-Secure, for example, used the Kaspersky antivirus engine in its own software between 1996 and 2006.