Ukrainian President Petro Poroshenko, left, in the cockpit of Sukhoi Su-27 aircraft on Defender of Ukraine Day, Zaporozhye.

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Ukrainian President Petro Poroshenko in the cockpit of Sukhoi Su-27 aircraft on Defender of Ukraine Day, Zaporozhye.

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Ukrainian President Petro Poroshenko in the cockpit of Sukhoi Su-27 aircraft on Defender of Ukraine Day, Zaporozhye.

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The ceremony to lay flowers on Defender of Ukraine Day at Glory Memorial in Kharkiv.

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The ceremony to lay flowers on Defender of Ukraine Day at Glory Memorial in Kharkiv.

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City residents at the ceremony to lay flowers on Defender of Ukraine Day at Glory Memorial in Kharkiv.

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Head of Kharkiv Regional State Administration Igor Rainin, center, at the ceremony to lay flowers on Defender of Ukraine Day at Glory Memorial in Kharkiv.

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Foreground, from left: Ukrainian Defense Minister Stepan Poltorak and Ukrainian President Petro Poroshenko at the exhibition of military equipment "Unconquered Strength" dedicated to Defender of Ukraine Day. Mikhailovska Square, Kiev.

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