The United States will welcome up to 100,000 Ukrainians and others fleeing Russia’s aggression, a senior administration official announced Thursday. “To meet this commitment, we are considering the full range of legal pathways to the United States,” the official said, which includes US refugee admissions program, parole and immigrant and non-immigrant visas. More than 3.5 million refugees have now fled Ukraine, according to data from the UN refugee agency released on Tuesday. A vast majority of those refugees have fled to Ukraine’s western neighbors across Europe.