I work on the railway. I am currently abroad with my child (I left because the war started). The head of the enterprise asks to write a statement of resignation at his own will, since he does not plan to continue the vacation without saving (justifies the fact that he has the right not to continue according to Article 12, Clause 2 of the Law of Ukraine #2136, because the railway is a critical infrastructure object) . I have no desire to resign, because I do not want to lose my seniority. I cannot return, because there are no guarantees of safety (there are fatal cases at the enterprise from being hit by a missile from an aggressor country). What statement should I write in order not to terminate the employment contract?