Ukrainian President Volodymyr Zelensky arrived in Poland on Thursday for security talks with President Andrzej Duda amid rising tensions over a Russian military build-up on the Ukrainian border. The two presidents will hold talks in Wisla on Thursday and Friday centering on regional security and the threat of Russian aggression. Support for Ukraine is one of Duda's priority policies, the head of the National Security Bureau, Pawel Soloch, stressed.