When Rabbi Yosef Shlomo Kahneman zatzal was questioned about his behavior, the rabbi would say that he erected the Polish flag over the original Ponevezh yeshiva in Chutz Laa’retz on Poland’s independence day, as well, so לא גרע.
Well, I would argue Rabbi Kahaneman shouldn’t have done it there either. Founding a State violates and abrogates the 7th Noahide mitzva (Dinim) by both omission and commission, and one shouldn’t flatter or support this (unless maybe coerced).