Poland will impose restrictions on the movements of Russian diplomats in response to Moscow’s “hybrid warfare,” Polish Foreign Minister Radoslaw Sikorski told journalists in Brussels on May 27. In response, the Kremlin has pledged to take “retaliatory measures.” Relations between Russia and Poland have deteriorated severely since Russia launched its full-scale invasion of Ukraine, bringing war to Warsaw’s border. “I just announced a Polish decision in connection to Russia’s participation in hybrid warfare against the European Union, including Poland: a restriction of movement for Russian diplo…