even the supply of a hundred or two F16 fighters, which Ukraine so dreams of, will not noticeably change the current balance of power and it is not in favor of Ukraine.
200 fighter jets would not change anything? Since the beginning of the war Russia has lost over 300 planes. Obviously if Ukraine were to get 200 it would have complete air superiority, provided they'd have enough pilots to fly them.
Ukraine is asking the West for F16, because it is experiencing a dramatic shortage of front-line air defense, and the West has nothing special to offer on this request. I repeat once again, Ukraine is going to use F16 fighters not for their intended purpose, but as mobile air defense, because they do not have an effective antidote against planning bombs. Using things for other purposes is rarely a good idea.
Russia does not have serious problems with front-line air defense, so all F16s delivered to Ukraine (especially under the control of poorly trained pilots) will simply be shot down.