The Ukrainian parliament speaker says President Petro Poroshenko will submit Ukraine's Association Agreement with the EU to the legislature on September 16.
Oleksandr Turchynov said the Verkhovna Rada would vote on ratification of the accord "immediately."
Turchynov said lawmakers had "no right to postpone ratification any longer."
He said Poroshenko had agreed with the European Parliament on the simultaneous ratification of the accord.
Ukraine's pro-Western government and the EU signed the political provisions of the Association Agreement in March and the economic portion in June, ignoring objections from Russia.
Former Ukrainian President Viktor Yanukoych abandoned plans to sign the Association Agreement last November, triggering months of protests that led to his ouster in February and touching off a crisis that resulted in Russia's annexation of Crimea and deadly conflict in eastern Ukraine.
Russia has proposed its amendments to the text of the Agreement.