The employer has a duty of care towards his employees according to Art. 328 Swiss Code of Obligations. There is an article (German only) on the topic of "Duty of care of the employer and legal consequences - with particular focus on health protection regarding "Expats""

There are also service providers which deal specifically with this topic in that they provide safety/security assessments for employers and advise them when dispatching employees to risk areas:
https://www.internationalsos.com/med...urity-services