According to the reports, Trump's team has told European officials that the U.S. president-elect expected NATO allies to increase their defense spending to 5 percent of national gross domestic product after his Jan. 20 inauguration — more than double the alliance's current 2 percent target.

Greek Prime Minister Kyriakos Mitsotakis said the guideline for NATO countries to spend at least 2% of their economic output on defense is “probably history.”

A group of four NATO leaders and a representative from the European Union have admitted they will need to increase their defence spending.

Next year, a new amount of money will be set for NATO's defense spending. This decision will be made after talks with newly elected US President Donald Trump, states Greek Prime Minister Kyriakos Mitsotakis.

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