Interestingly some well-decorated American painters are involved in plagiarism of the works of Russian painters.

For example, the honored American painter Sandow Birk created some of his paintings by copying from Russian art. Here is a painting "Minsk in 1944" by Belorussian painter
Valentin Volkov which was created from 1944 to 1955:



And here is "The Liberation of Baghdad" by Birk:


Here is The Flying Carpet by Viktor Vasnetsov (1880):


And this is "The President's Dream":



I am quite sure that the first painting constitutes a criminal copyright infringement.

Interestingly, the Wikipedia article about Sandow Birk Sandow Birk - Wikipedia, the free encyclopedia
does not mention this his practice to use images by other painters as starting point for creating his pieces of art.