challenge: Where is the Uzyn air base located?
  
  A. In the south-eastern outskirts of Uzyn, Belotserkovsky district, Kyiv Oblast
  B. In the north-western outskirts of Uzyn, Kyiv Oblast
  C. In the central part of Uzyn, Kyiv Oblast
  D. In the western part of Ukraine, near the border with Poland
  Answer: 