Jens Stoltenberg

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NATO Secretary General Jens Stoltenberg gestures during a press conference in Kosovo's capital Pristina on Friday, Jan. 3, 2017. NATO Secretary General Jens Stoltenberg has joined the international community calling on Kosovo and Serbia to normalize their ties. Stoltenberg on Friday is a one-day visit to Kosovo where he meet with local senior officials. (AP Photo/Visar Kryeziu)

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FILE - In this Wednesday, July 13, 2016 file photo, NATO Secretary General Jens Stoltenberg speaks during a news conference at NATO headquarters in Brussels, Belgium. NATO’s secretary-general says his bid to become the alliance’s chief was supported by U.S. President Barack Obama, who worked behind the scenes to make it happen. In an autobiography published Friday, Sept. 30 titled "My Story,” former Norwegian prime minister Jens Stoltenberg wrote that Obama sent him a letter in late 2013 after Stoltenberg had resigned because his Labor Party had lost a parliamentary election. (AP Photo/Darko Vojinovic, file)

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NATO Secretary General Jens Stoltenberg (left) is welcomed by Polish President Andrzej Duda to Warsaw, which will host a two-day summit starting Friday. It is the first time Poland has hosted a top-level meeting of the Western military alliance, which it joined in 1999. The summit will be "a defining moment for our security," Mr. Stoltenberg said Thursday. (Associated Press)

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Vice President Joe Biden listens to remarks to the media during a meeting between President Barack Obama and NATO Secretary General Jens Stoltenberg, Tuesday, May 26, 2015, in the Oval Office of the White House in Washington. (AP Photo/Pablo Martinez Monsivais)

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President Barack Obama listens as NATO Secretary General Jens Stoltenberg speaks to members of the media during their meeting, Tuesday, May 26, 2015, in the Oval Office of the White House in Washington. (AP Photo/Pablo Martinez Monsivais)

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Secretary General of NATO Jens Stoltenberg said that while it is "too early" to comment on proposals to provide permanent NATO troops to the Baltic states of Estonia, Latvia and Lithuania, they may be considered. (Associated Press)

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** FILE ** In this June 25, 2013, file photo, Norway's Prime Minister Jens Stoltenberg speaks during a news conference at the Presidential palace in Vilnius, Lithuania. NATO announced on Friday, March 28, 2014, that former Norwegian Prime Minister Jens Stoltenberg will become chief of the NATO alliance when current NATO Secretary General Anders Fogh Rasmussen steps down in the autumn of 2014. (AP Photo/Mindaugas Kulbis, File)