On Monday, as I listened to President Donald Trump’s inauguration speech, I thought about Alexander Esenin-Volpin. It had been a morning of Trump updates that weren’t just upsetting, but also befuddling.

Europe's reliance on the U.S. security umbrella faces a turning point under Trump’s nationalist, transactional approach

If Putin were to come to terms with Ukraine, ending his war of conquest, Trump could offer Russia a role in the Artemis program in exchange. The incoming U.S. president could point out that Russia has prospered as a result of the International Space Station partnership. Without that partnership, Russia would not be any kind of space power,

Europe warns its airlines to stay away through next summer, as Ukraine turns skies of western Russia into a battlefield.

The loose arrangement of hostile powers could pose a series of conundrums for President-elect Donald Trump’s pick for secretary of state.

In the lead-up to his inauguration, President Donald Trump identified a surprising priority: Greenland. Trump wants to purchase the island, which is an “autonomous” province of Denmark; take control of the Panama Canal;

In a speech on Tuesday, Rubio defended his department’s employees but warned of alterations to come under Trump.

PRESIDENT DUDA: I had this meeting with Donald Trump in New York in April. MR. IGNATIUS: Yes. PRESIDENT DUDA: That was in April. Not in June.

U.S. President Donald Trump said on Tuesday he would likely impose sanctions on Russia if its president, Vladimir Putin, refuses to negotiate about ending the war in Ukraine.

January 21 is remembered as the day the first commercial Concorde flight took off from London and Paris Airports simultaneously in 1976. Meanwhile, thousands of women took out a march across 400 cities against Donald Trump’s first full day as president of the United States in 2017.

Donald Trump was sworn into office on Monday for a second term in the White House, and international figures across the globe are sharing their reactions to the 47th president's inauguration. Here's what world leaders are saying: