According to the reports, the planes were on a "spy mission" that may be connected to the assassination of a Syrian national in his vehicle Wednesday in the Hungarian capital.Ynet article.Meanwhile, the Hungarian Foreign Ministry said that air traffic in the country is under the jurisdiction of the local aviation authority. The Ministry refused to address questions regarding the nature of the mission that prompted the Israeli planes to arrive in Hungary.
'Israeli spy planes flew over Budapest' - Israel News, Ynetnews
I wouldn't trust these in our airspace. There would only be one action i'd highly recommend.