Polish President Andrzej Duda said this during a visit to the General Staff of the Armed Forces of Poland, an Ukrinform correspondent in Poland reports.
"There is no secret that Russian troops operate in Ukraine, and this means the security deterioration. We and NATO should be ready to respond to possible acts of aggression," Duda said, commenting on the information of Polish media about spotting several Russian drones over the territory of Poland this year.
He stressed that Russian annexation of Crimea and ongoing conflict in Luhansk and Donetsk regions testified to the deteriorating security situation in the region.
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