https://obamawhitehouse.archives.gov/the-press-office/2016/05/18/president-obama-announces-more-key-administration-posts

WASHINGTON, DC – Today, President Barack Obama announced his intent to nominate the following individuals to key Administration posts:

Marie L. Yovanovitch – Ambassador to Ukraine, Department of State

she has also served at posts in Canada, Russia, Somalia, and the United Kingdom.

https://www.rferl.org/a/us-rejects-top-ukrainian-prosecutors-dont-prosecute-accusation/29834853.html

The U.S. State Department has dismissed a reported claim by Ukrainian Prosecutor-General Yuriy Lutsenko that U.S. Ambassador Marie Yovanovitch gave him "a list of people whom we should not prosecute."

The back-and-forth comes less than two weeks ahead of a Ukrainian presidential election in which challengers have sought to paint incumbent Petro Poroshenko as failing to combat corruption and abuses of power since taking office in mid-2014.

"The statement of Ukraine's prosecutor-general does not correspond to reality and is meant to weaken the reputation of Ambassador Yovanovitch," the State Department said.

Lutsenko's assertion came in an interview broadcast by The Hill's TV arm on March 20.