PresidentDonald Trump, right, and Ukraine's President Volodymyr Zelenskyy shake hands at the start of a joint news conference following a meeting at Trump's Mar-a-Lago club on Dec. 28 in Palm Beach, Fla ... .
Anzhelika Kotlyantseva shows an old photo of her daughter, Mariia Vainshtein, wearing the flag of Ukraine after she won a tennis tournament at the CaryLeedsCenter for Tennis and Learning in the Bronx borough of New York on Jan ... .
Mariia Vainshtein's family fled Ukraine shortly after Russia launched its invasion four years ago. They moved to New York, where they had family. The adjustment was difficult for Vainshtein, who hoped she would one day to come to the U.S ... .
With the proliferation of unmanned aerial vehicles across the globe, military tactics have been forced to evolve, which means new, high-tech weapons ... .