"He writes a novel about youth."
Translation:Він пише роман про молодь.
Новела doesn't have one-to-one correspondence in English. Usually it's translated as short story, but this also means оповідання. English doesn't have the distinction between новела and оповідання.
Note that English also has the word 'novella', which is closer to the Ukrainian повість.
A novella is a long short story or a very short novel. English does indeed distinguish it from short stories.