Translation:Are those Russian airplanes or Dutch ones?
Yes, but leave "ones" off the sentence. In this form that word is not needed.
If there's a noun after an adjective, we use singular adjective and plural noun :)
I believe because it's directly describing "airplanes" ("Russian airplanes", not "the airplanes are Russian")
I am glad to see a question in this section that is pretty realistic. Because the russian and the dutch flags are pretty similar.
but the roundel on their planes are not, the dutch ones have a divided blue-red-white circle with an orange center whereas the russians have a red star