By Anna Wlodarczak-Semczuk, Pawel Florkiewicz and Luiza Ilie WARSAW/BUCHAREST (Reuters) -More than 3.5 million people have fled abroad from the war in Ukraine, United Nations data showed on Tuesday, leaving Eastern Europe scrambling to provide them with care, schools and jobs even as daily numbers crossing borders ease. The millions who have left Ukraine since Russia’s invasion began have made their way on foot, by rail, bus or car to neighbouring countries such as Poland and Romania before some travel on across Europe. Most, however, have not done so. While fewer have crossed borders over the…