George Kent said that Amb. Pyatt made a speech in Sept. 2015 and that it was clear the U.S. was "pushing for Shokin's ouster."
Transcript of Pyatt's speech says the U.S. wanted to work with Shokin in the fight against corruption.

Speech: https://web.archive.org/web/20150926092251/http://ukraine.usembassy.gov/statements/ambpyatt-odesa-finforum-09242015.html
Transcript of Pyatt's speech says the U.S. wanted to work with Shokin in the fight against corruption.

Speech: https://web.archive.org/web/20150926092251/http://ukraine.usembassy.gov/statements/ambpyatt-odesa-finforum-09242015.html
Amb. Pyatt did call for the firing of officials involved in the closing of the case against Zlochevsky in late December 2014.
But Shokin was not one of the officials involved. His term began in February 2015.
But Shokin was not one of the officials involved. His term began in February 2015.