Employees of Primary Care Center and Family Clinic walk by the entrance of their work place, destroyed by a military strike, amid Russia's invasion of Ukraine, in Mykolaiv, Ukraine, September 4, 2022. REUTERS/Umit Bektas

According to estimates by British secret services, the lack of morale among Russian troops in Ukraine may also be due to poor pay. In addition to the high number of casualties and increasing combat fatigue, the salary is one of the greatest grievances, according to a short report by the British Ministry of Defense on Sunday.