A soldier of the Polish Army sits in a tank as a NATO flag flies behind during the NATO Noble Jump military exercises of the VJTF forces on June 18, 2015 in Zagan, Poland. (Sean Gallup/Getty Images)
President-elect Donald Trump speaks at a news cenference at Trump Tower on January 11, 2017 in New York City. This is Trump's first official news conference since the November elections. (Photo by Spencer Platt/Getty Images)
Exxon Mobil Corporation CEO Rex Tillerson and Russia's Prime Minister Vladimir Putin (L-R front) during a meeting at Novo-Ogaryovo residence, April 16, 2012. (Alexei Nikolsky\TASS via Getty Images)
Vice President-elect Mike Pence and President-elect Donald Trump talk during Trump's press conference at Trump Tower in New York on January 11, 2017. (TIMOTHY A. CLARY/AFP/Getty Images)