Later, he moved to the Ministry of Health, starting as a chief specialist and eventually becoming director of the State Sanitary Department of Ukraine.

[4] From 2015 to 2018, he acted as a public health consultant in the "HIV Service Reform in Action", a United States Agency for International Development (USAID) project.

The same year, Liashko returned to the civil service, taking the position of Deputy Director General of the Centre for Public Health.

[5] On 24 December 2019, Liashko was appointed as Deputy Minister of Healthcare of Ukraine, serving under Zoriana Skaletska.

In this position, he participated in the evacuation of Ukrainian citizens from Wuhan, China at the beginning of COVID-19 pandemic.