This game was on my cousin's dad PC about 20 years ago. There were no name on the icon, it was just titled "war" (assumingly by cousin). Later I got Arma: Armed Assault on Steam, when all my friends played Arma 2/DayZ and I couldn't, because my PC was a potato. Spent hours on sandbox editor making big warfare.
Monday - "понедельник", which is coming from the "day after the (previous) week", i.e. after the Sunday
Tuesday - "вторник", true here, has "second" in the name
Wednesday - "среда", has "middle" in the name
Thursday - "четверг", also true, has "fourth" in the name
Friday - "пятница", also true, has "fifth" in the name
Saturday - "суббота", derived from the Hebrew "shabbat"
Sunday - "воскресенье", almost the same word as "воскресение", which is the Christian Church word for the Resurrection (of Jesus Christ)