The head of state published the greetings on his Twitter page.
"I congratulate Austria on the National Day! I wish the Austrians and their wonderful country peace, concord and prosperity," Poroshenko wrote.
He recalled that this year agreement was reached with Austrian Chancellor Sebastian Kurz that the year 2019 will be the year of Ukrainian culture in Austria.
"I'm sure this will further strengthen the friendship between our peoples," Poroshenko said.
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