Poland has arrested 18 people on allegations of pursuing hostile activities or planning sabotage on behalf of Russia and Belarus, including plans to assassinate Ukraine’s President Volodymyr Zelenskyy, the interior minister said Monday. Ten of those arrested since December were directly involved in planning various forms of sabotage across Poland, Interior Minister Tomasz Siemoniak told a news conference. Polish, Belarusian and Ukrainian nationals are among those arrested in recent months, according to the Internal Security Agency’s communiques.