"Not from the outside - I mean Russia. Neither from within Ukraine - not a fifth of the column we will not tolerate. Neither within NATO, "the press service quoted the president as saying.
He also stressed that with Ukraine one can not talk in the language of blackmail.
"In my deep conviction, who will talk with us in the language of blackmail - will be in isolation himself," added Poroshenko.
Earlier, the Ukrainian leader said that Russia would not be able to block Ukraine's accession to NATO.
The Hungarian Foreign Ministry noted that they will not support the rapprochement of Kiev with the alliance, while the situation in Ukraine will not improve with the national minorities.
In April, Hungary announced its intention to continue to oppose Ukraine's accession to NATO.