Tiamat
I've seen the future...
Technically they have always been like that. If you took any diary of a Polish soldier or commander from, say, the 16th century and the 20th century, you wouldn't see much difference in the behavior of the Moscow army.
It was a horde without discipline in the 16th century, it was a horde without discipline in the 17th century, it was a horde without discipline in the 18th century, it was a horde without discipline in the 19th century, it was a horde without discipline in the 20th century, and it is a horde without discipline in the 21st century.
The problem is that while previously they could count on the human losses to make up for themselves sooner or later, thanks to the USSR and communism they lost that advantage as well.
Also doesn't help them that Russians have always struggled with logistics to an extent it seems.