President of Ukraine Petro Poroshenko in a telephone conversation with his Polish counterpart Andrzej Duda has condemned the attack on the Consulate General of Poland in Lutsk, Volyn region, and offered to involve Polish experts in the investigation of this incident.

"Petro Poroshenko offered to engage Polish experts in the investigative group to identify those responsible for this crime," the presidential press service said on Wednesday.

In a conversation with Duda, Poroshenko condemned the attack on the Consulate General of Poland in Lutsk. "The Ukrainian government will act decisively to prevent such provocations in the future," he assured.

The president of Ukraine said that he instructed to step up the security of not only diplomatic missions in Ukraine, but also of places of historical memory.

"The leaders of the two states agreed that no provocations should affect friendly Polish-Ukrainian relations, the interlocutors agreed to continue contacts at the highest level," the press service of the Ukrainian head of state reported.

As reported, unknown assailants attacked the Polish Consulate General in Lutsk in the early hours of March 29. A criminal case under the "terrorist attack" article of the Criminal Code of Ukraine has been launched.

Ukrainian Ambassador to Poland Andriy Deschytsia was summoned by the Polish Foreign Ministry in connection with the incident, and the Polish Embassy in Kyiv will present a note of protest to the Ukrainian Foreign Ministry.