Yatsenyuk Government
In the first Yatsenyuk Government (appointed in late February 2014), Onyschenko served as the Deputy Minister of Justice and also chaired the State Registration Service. Ranked 58th on the electoral list of People's Front, she was elected into parliament in the October 2014 Ukrainian parliamentary election. On 2 December 2014, she was appointed Minister of the Cabinet of Ministers in the second Yatsenyuk Government. She did not retain this post in the Groysman Government that was installed on 14 April 2016.