Researchers at the Yale Chief Executive Leadership Institute have determined the current operating status of American and international corporations in Russia using regulatory filings, tax documents, company statements, financial analyst reports, media reports and direct contacts.  This is the status of American healthcare companies in Russia following the February invasion of Ukraine: Still operating: Align Technology: Phoenix-based manufacturer of 3D digital scanners and Invisalign clear aligners used in orthodontics  Amgen: biopharmaceutical company headquartered in Thousand Oaks, Calif.