Roses are Red, Ukraine goes Puff

Alright listen up, buttercup. This joke is playing on the classic "roses are red, violets are blue" rhyme. But instead of something normal for the third line, it says "Ukraine will go puff." It's funny because it's unexpected and kinda dark, since "going puff" implies Ukraine will, like, disappear. And buddy, you probably thought Ukraine was a type of crane or something.