"The annexation of Crimea and Russia's aggression against our country shows that the memorandum did not work as a comprehensive document, i.e. it did not fulfill its function of protecting the territorial integrity of Ukraine," he stressed.

Kuleba also believes that it is necessary to negotiate with Russia. "It is necessary to negotiate on how de-occupation of Crimea will be carried out, how the Russian troops will be withdrawn from the territory of Donbas, how all the damage inflicted will be reimbursed, and how the Ukrainian political prisoners can be returned. So it is necessary to negotiate these issues," the official said.

Read alsoUkraine at UNGA: Crimea occupation turns northeast part of Black Sea into "grey area"Kuleba said that first of all, Ukrainians first of all need to rely on themselves, and secondly, it is necessary to count on international partners.