Ukrainian President Petro Poroshenko and Polish special presidential envoy and State Secretary Krzysztof Szczerski discussed a roadmap of contacts between the two leaders.

"The Ukrainian head of state invited Polish President Andrzej Duda to visit Ukraine," the Ukrainian presidential press service reported following Poroshenko's meeting with Szczerski in Kyiv on Friday.

"The development of our relations will make the countries stronger and will enhance the level of confidence," Poroshenko said.

He also thanked Poland for its active position and solidarity in defending Ukraine's interests in the international arena, particularly in the way of European integration.

"The president mentioned the potential and the importance of the development of relations between the countries. In particular, Ukraine attaches particular significance to the strengthening of military-technological cooperation, including within the framework of the Ukrainian-Polish-Lithuanian brigade," it said.

Szczerski reaffirmed the Polish president's unwavering position on continuing strategic partnership between the two countries.

The two leaders also discussed constitutional reform in Ukraine, particularly amendments concerning decentralization of power. Poroshenko pointed out that the decentralization reform was based on a Polish model and was developed with active assistance from Polish experts.