Usually dogs and cats are just there. Hungry and lonely, abandoned by their owners or having no alive owners. Between feeding and not feeding such pets soldiers choose the first one. And the pets start living with the soldiers. Then the soldiers make photos of their new pets. So, it's not propaganda.
And there's an important correction: animals are victims of what Russians are doing.
edit: If it was a picture of a cat with a Russian soldier, something tells me your attitude would be very different. I support kicking out the invaders, but propaganda playing with emotions doesn't sit well with me.