The U.S. ambassador to the United Nations welcomed an upcoming trip by a senior Brazilian official to Ukraine but said that any negotiations should not "reward" Russia. Ambassador Linda Thomas-Greenfield said that the United States is not barring Brazil from engaging on peace. “What we have said is that engagement has to take Ukraine into account, and it cannot be a negotiation based on rewarding Russia for taking Ukraine territory," she said on May 4 as she concluded a trip to Brazil ahead of a trip by senior aide Celso Amorim to Ukraine. Thomas-Greenfield met with Amorim during her visit.