Question:
Who was the chair of National Police of Ukraine in Jun, 2019?

Context:
 Vadym Troyan is the chair of National Police of Ukraine from Nov, 2016 to Feb, 2017. 
 Khatia Dekanoidze is the chair of National Police of Ukraine from Nov, 2015 to Nov, 2016. 
 Serhiy Knyazev is the chair of National Police of Ukraine from Feb, 2017 to Sep, 2019.

Answer:
Serhiy Knyazev