I was talking to someone the other day about Russia’s collective casualties just from ~1913-1945. You have:
WWI (4-6mill depending on the source)
the Russian civil war (10-12mill IIRC)
WWII (wide range but most scholars IME settle on 20-25mill throughout the Soviet Union).
So we’re talking, super conservatively, 20-30mill Russians dead if we remove non-Russian Soviet Union casualties. This is in just over 30 years. Most of these will be men which massive influenced their demographics until the 80’s or so. Women used to outnumber men around 2:1 if memory serves.
A lot of napkin math but all of this is to say: in 1910 Russia was over 160mill people. Today, it’s under 145mill.
Their invasion of Ukraine has led to somewhere between 250,000-450,000 Russians dead.