Earlier quoted context omitted.
US did not have air superiority in proxy wars in Syria nor in Ukraine. Should the next proxy war happen in LATAM/Africa/ME - I am not sure US would rush to deploy air assets. For example - Iran/China - would US create no fly zone over these countries?
NATO absolutely has air superiority in Ukraine. How they choose to exercise that is an exercise for you, the reader, whoever would like - not this comment.
for different factions of rebels backed by Pentagon/CIA/etc/etc