First Lady Jill Biden, left, greets Olena Zelenska, spouse of Ukrainian's President Volodymyr Zelenskyy, outside School 6, a public school that has taken in displaced students in Uzhhorod, Ukraine, Sunday, May 8, 2022. (AP Photo/Susan Walsh, Pool)

First Lady Jill Biden and Olena Zelenska, wife of Ukrainian's President Volodymyr Zelenskyy, visit School 6, a public school that has taken in displaced students in Uzhhorod, Ukraine, Sunday, May 8, 2022. (AP Photo/Susan Walsh, Pool)

First Lady Jill Biden, left, and Olena Zelenska, spouse of Ukrainian's President Volodymyr Zelenskyy, right, join a group of children at School 6 in making tissue-paper bears to give as Mother's Day gifts in Uzhhorod, Ukraine, Sunday, May 8, 2022. (AP Photo/Susan Walsh, Pool)

First Lady Jill Biden, second left, and Olena Zelenska, spouse of Ukrainian's President Volodymyr Zelenskyy, join a group of children at School 6 in making tissue-paper bears to give as Mother's Day gifts in Uzhhorod, Ukraine, Sunday, May 8, 2022. (AP Photo/Susan Walsh, Pool)

First Lady Jill Biden, second left, and Olena Zelenska, spouse of Ukrainian's President Volodymyr Zelenskyy, right, visit School 6, a public school that has taken in displaced students in Uzhhorod, Ukraine, Sunday, May 8, 2022. (AP Photo/Susan Walsh, Pool)

First Lady Jill Biden reaches out to hug Olena Zelenska, spouse of Ukrainian's President Volodymyr Zelenskyy, left, at the end of their visit to School 6, a public school that has taken in displaced students in Uzhhorod, Ukraine, Sunday, May 8, 2022. (AP Photo/Susan Walsh, Pool)

First Lady Jill Biden talks with Olena Zelenska, spouse of Ukrainian's President Volodymyr Zelenskyy, left, at the end of their visit to School 6, a public school that has taken in displaced students in Uzhhorod, Ukraine, Sunday, May 8, 2022. (AP Photo/Susan Walsh, Pool)

TOPSHOT US First lady Jill Biden (L) receives flowers from Ukraine President wife Olena Zelenska, outside of School 6, a public school that has taken in displaced students in Uzhhorod on May 8, 2022, during an unannounced visit of Jill Biden to Ukraine on the sidelines of an official trip in nearby Slovakia. (Photo by Susan Walsh / POOL / AFP)

US First lady Jill Biden (L) receives flowers from Ukraine President wife Olena Zelenska, outside of School 6, a public school that has taken in displaced students in Uzhhorod on May 8, 2022, during an unannounced visit of Jill Biden to Ukraine on the sidelines of an official trip in nearby Slovakia. (Photo by Susan Walsh / POOL / AFP)

US First lady Jill Biden (L) receives flowers from Ukraine President wife Olena Zelenska, outside of School 6, a public school that has taken in displaced students in Uzhhorod on May 8, 2022, during an unannounced visit of Jill Biden to Ukraine on the sidelines of an official trip in nearby Slovakia. (Photo by Susan Walsh / POOL / AFP)

US First lady Jill Biden (L) receives flowers from Ukraine President wife Olena Zelenska, outside of School 6, a public school that has taken in displaced students in Uzhhorod on May 8, 2022, during an unannounced visit of Jill Biden to Ukraine on the sidelines of an official trip in nearby Slovakia. (Photo by Susan Walsh / POOL / AFP)

US First lady Jill Biden (L) receives flowers from Ukraine President wife Olena Zelenska, outside of School 6, a public school that has taken in displaced students in Uzhhorod on May 8, 2022, during an unannounced visit of Jill Biden to Ukraine on the sidelines of an official trip in nearby Slovakia. (Photo by Susan Walsh / POOL / AFP)

US First lady Jill Biden (L) meets with Ukraine President wife Olena Zelenska (R), at School 6, a public school that has taken in displaced students in Uzhhorod on May 8, 2022, during an unannounced visit of Jill Biden to Ukraine on the sidelines of an official trip in nearby Slovakia. (Photo by Susan Walsh / POOL / AFP)

US First lady Jill Biden (L) and Ukraine President wife Olena Zelenska (R) join a group of children making tissue-paper bears for Mother's Day gifts at School 6, a public school that has taken in displaced students in Uzhhorod on May 8, 2022, during an unannounced visit of Jill Biden to Ukraine on the sidelines of an official trip in nearby Slovakia. (Photo by Susan Walsh / POOL / AFP)

US First lady Jill Biden (2L) and Ukraine President wife Olena Zelenska (R) visit the School 6, a public school that has taken in displaced students in Uzhhorod on May 8, 2022, during an unannounced visit of Jill Biden to Ukraine on the sidelines of an official trip in nearby Slovakia. (Photo by Susan Walsh / POOL / AFP)

US First Lady Jill Biden (2L), and Ukraine President wife Olena Zelenska (R) join a group of children making tissue-paper bears to give as Mother's Day gifts at School 6 in Uzhhorod, on May 8, 2022, during an unannounced visit of Jill Biden to Ukraine on the sidelines of an official trip in nearby Slovakia. (Photo by Susan Walsh / POOL / AFP)

US First lady Jill Biden (R) and Ukraine President wife Olena Zelenska (L) speak during a visit at the School 6, a public school that has taken in displaced students in Uzhhorod on May 8, 2022, during an unannounced visit of Jill Biden to Ukraine on the sidelines of an official trip in nearby Slovakia. (Photo by Susan Walsh / POOL / AFP)

US First lady Jill Biden (CL) and Ukraine President wife Olena Zelenska (CR) visit the School 6, a public school that has taken in displaced students in Uzhhorod on May 8, 2022, during an unannounced visit of Jill Biden to Ukraine on the sidelines of an official trip in nearby Slovakia. (Photo by Susan Walsh / POOL / AFP)

US First lady Jill Biden (2L) and Ukraine President wife Olena Zelenska (2R) visit the School 6, a public school that has taken in displaced students in Uzhhorod on May 8, 2022, during an unannounced visit of Jill Biden to Ukraine on the sidelines of an official trip in nearby Slovakia. (Photo by Susan Walsh / POOL / AFP)

US First lady Jill Biden (L) and Ukraine President wife Olena Zelenska (CR) visit the School 6, a public school that has taken in displaced students in Uzhhorod on May 8, 2022, during an unannounced visit of Jill Biden to Ukraine on the sidelines of an official trip in nearby Slovakia. (Photo by Susan Walsh / POOL / AFP)