Hi, Lorimer, and welcome to the forum!
Are there any markings anywhere on these figures or under the bases? Are they metal or plastic? The Russians' bases make me ask that question.
At a quick glance, the Russians (your first photo) look to me to be of newer manufacture than the other group of soldiers. By that, I mean that they look to me like they were made in the past 20 years. The others look like they could be older.
I've seen similar sets of Russians, unmarked, unfortunately, sold by Sergei Ilyashenko in his Lead Army line. They came from one of the numerous Russian makers of castings, and were probably then painted by another shop and packaged and sold.
That's everything off the top of my head. I can check my references when I get home and see what I can find.
Prost!
Brad