By DARLENE SUPERVILLE UZHHOROD, Ukraine (AP) — Jill Biden made an unannounced visit to western Ukraine on Sunday, holding a surprise Mother’s Day meeting with first lady Olena Zelenska to show U.S. support for the embattled nation as Russia presses its punishing war in the eastern regions. She became the latest high-profile American to enter Ukraine during the war, while Zalenska’s public appearance