From the UK Government Foreign Travel Advice: Ukraine

If you require medical evacuation or support to leave Ukraine, a number of private companies are offering this service. The FCDO cannot endorse or recommend any companies. You should research whether a service provider will be suitable for your requirements and meets code of conduct and safety standards. Should you decide to pursue this, the Security in Complex Environments Group (SCEG) has several member companies that can provide support in Ukraine. These companies have accredited certification for international standards. The FCDO provides details of SCEG for information only. The current list of SCEG members is shown on the SCEG website…

If you need assistance, please contact SCEG immediately by completing the email on the Contact page.