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Demonstrators critical of the government clash with the security forces of the state, May 1st, 2019. (picture alliance/Getty Images)

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US President Donald Trump, with US Ambassador to Canada Kelly Knight Craft, walks to Air Force One in Canada, June 9, 2018. (SAUL LOEB/Getty Images)

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S-400 Triumf surface-to-air missile systems of the Russian Southern Military District's missile regiment on combat duty. (Sergei Malgavko/Getty Images)

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Technicians work in a crane next to Notre Dame cathedral following the massive fire earlier this month, on April 29, 2019 in Paris, France. (Chesnot/Getty Images)

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An intelligent robot copies the movement of a visitor wearing sensor suit at the 5G stand during "Expo 2019 Beijing" on April 29, 2019. (VCG/Getty Images)

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A truck moves a shipping container at Qingdao Port on January 14, 2019 in Qingdao, Shandong Province of China. (VCG/Getty Images)

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People visit the Qualcomm stand at the Mobile World Congress (MWC) in Barcelona on February 27, 2019. (PAU BARRENA/AFP/Getty Images)

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Erasmusbrug or Erasmus Bridge in Rotterdam, Netherlands on 25 February 2018. (NurPhoto/Getty Images)