President-elect Donald Trump said during his campaign days that he might abandon the assurance of protection for the fellow NATO countries but contrary to the statement of President Obama, told the reporters that Trump has "expressed great interest" to uphold the US commitment to NATO. The statements of Trump has alarmed the Baltic states, which fears the Russian aggression.

According to BBC, the Article 5 of the NATO treaty in which commits the allies to come to the aid of a member state who is under attack. But in July Trump said that the US will only come to the aid of the allies if they have fulfilled their duties and obligations to the US.

Obama has arrived in Athens, the Greek capital and it will be the final and official overseas trip of Obama. The foreign visit is expected to calm the nerves of some world leaders over the upcoming Trump administration and shares concern over the controversial statements of Trump during his campaign.

Obama comes to Athens to talk about the democracy and there is a lot for him to consider. In Ancient Greece, there's a speaker known as demagogues who stir up the crowds with the promise of actions against the state's nemeses. Greece has some lessons for the outgoing president, January 2015 when the global wave of populism left-wing Syriza movement came to power. Alexis Tsipras, leader of the party promised to take down a corrupt system but in almost two years, Tsipras finds himself carrying out the policies he campaigned against, Independent has reported.

Obama expected to spend much time in Athens explaining and defending the motivations of Trump. Obama urged President-elect Trump to reach out and send signals of unity towards women and minority group and to other organizations who were concerned about his campaign. Obama then urged his fellow democrats to recognize the results and how democracy works.

General Jens Stoltenberg, the NATO Secretary said that he is certain that Trump will be the president and they will all live up the commitments of the US in the alliance. On Monday, Kremlin said that President Putin had spoken with Trump over the phone and agreed on improvement over US-Russia relations.