Ukrainian president Petro Poroshenko and Lt. Col. Christopher Ridlon observe Ukrainian Su-27s as they pass overhead during the president's visit to the Clear Sky 2018 exercise at Starokostiantyniv Air Base, Ukraine, Oct. 11. Clear Sky 18 is the first large-scale, air-centric, multinational regional security exercise that United States Air Forces in Europe - Air Forces Africa has sponsored in eastern Europe since 2014.

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Size: 1733px × 1154px
Photo credit: © David Wa / Alamy / Afripics
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