Ukrainian President Petro Poroshenko, right, and United States Secretary of Defense James Mattis during a meeting in Kiev. (Image is a handout provided by a third party. For editorial use only. Archiving, commercial use or advertising is prohibited).

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Ukrainian President Petro Poroshenko, right, and United States Secretary of Defense James Mattis during a meeting in Kiev. (Image is a handout provided by a third party. For editorial use only. Archiving, commercial use or advertising is prohibited).

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Ukrainian President Petro Poroshenko, right, and United States Secretary of Defense James Mattis during a joint news conference in Kiev. (Image is a handout provided by a third party. For editorial use only. Archiving, commercial use or advertising is prohibited).

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Ukrainian President Petro Poroshenko, left, and United States Secretary of Defense James Mattis during a meeting in Kiev. (Image is a handout provided by a third party. For editorial use only. Archiving, commercial use or advertising is prohibited).

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United States Secretary of Defense James Mattis during a joint news conference with Ukrainian President Petro Poroshenko in Kiev. (Image is a handout provided by a third party. For editorial use only. Archiving, commercial use or advertising is prohibited).

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Ukrainian President Petro Poroshenko, right, and United States Secretary of Defense James Mattis during a joint news conference in Kiev. (Image is a handout provided by a third party. For editorial use only. Archiving, commercial use or advertising is prohibited).

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Ukrainian President Petro Poroshenko during a joint news conference with United States Secretary of Defense James Mattis in Kiev. (Image is a handount provided by a third party. For editorial use only. Archiving, commercial use or advertising is prohibited).

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Ukrainian President Petro Poroshenko, left, and United States Secretary of Defense James Mattis meet in Kiev. (Image provided by a third party. For editorial use only. Archiving, commercial use or advertising is prohibited).

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Ukrainian President Petro Poroshenko, third left, and United States Secretary of Defense James Mattis, second right, meet in Kiev. (Image provided by a third party. For editorial use only. Archiving, commercial use or advertising is prohibited).

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United States Secretary of Defense James Mattis during a Kiev meeting with Ukrainian President Petro Poroshenko (Image provided by a third party. For editorial use only. Archiving, commercial use or advertising is prohibited).

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Ukrainian President Petro Poroshenko, right, and United States Secretary of Defense James Mattis meet in Kiev. (Image provided by a third party. For editorial use only. Archiving, commercial use or advertising is prohibited).

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Ukrainian President Petro Poroshenko, right, and United States Secretary of Defense James Mattis meet in Kiev. (Image provided by a third party. For editorial use only. Archiving, commercial use or advertising is prohibited).

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