Donald Trump And NATO Secretary General Jens Stoltenberg Hold Joint News Conf.

WASHINGTON, DC - APRIL 12: NATO Secretary General Jens Stoltenberg (L) and U.S. President Donald Trump hold a news conference in the East Room of the White House April 12, 2017 in Washington, DC. Trump reaffirmed the United States' commitment to the North Atlantic alliance and its "ironclad" pledge to defend NATO allies, even though he repeatedly questioned the relevance of the military organization during the campaign. Chip Somodevilla/Getty Images/AFP

From stroking US President Donald Trump's ego to a "Finnish solution" for peace in Ukraine, former NATO chief Jens Stoltenberg opens up about his decade as head of the alliance in a new memoir.

In "On My Watch" launched Monday in Norway, Stoltenberg revealed behind-the-scenes details of a 2018 NATO summit when Trump, during his first term, threatened to walk out due to a number of European countries' failures to meet NATO's two percent defence budget target.

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