"I welcome the EU Council's official decision to impose sanctions against five persons responsible for illegal holding of presidential elections in temporarily occupied Crimea and Sevastopol," he wrote on Facebook on May 14.

Read alsoMFA Ukraine believes EU to expand Russia sanctions over Crimea grab

According to the president, "the punishment for any illegal action against the sovereignty and territorial integrity of Ukraine is inevitable."

Poroshenko said his meetings in the German city of Aachen with the leaders of the EU, France and Germany clearly confirmed that "the subject of ending the Russian occupation and restoration of Ukraine's sovereignty over Crimea is one of the top priorities of the European agenda."

As UNIAN reported earlier, the media reported in late April that the European Union intends to freeze the assets of five Russians responsible for holding Russian presidential elections in temporarily occupied Crimea on March 18, 2018.

At the same time, the Ministry of Foreign Affairs of Ukraine said it would insist on imposing sanctions against all the organizers of the elections.