It depends. Are you referring about other countries Business visa or US H1B visas ?
If it is US H1B visa Employer can terminate by informing to US immigration services. If employee is based at US at the time of termination return airfare cost to be provided to the employee and his family also provided they stayed along with the employee. However if the request for relief is from employee, employer is not under obligation to provide return air fare. In some companies they will recover the visa cost paid by the employer for normal business visa obtained for business travel.
19th June 2019 From India, Madras