Brazil is not the only country to have had dramatic election results this weekend. In Serbia, longtime leader Aleksandar Vucic lost a historic election that brought down his government. William Brangham discussed the results with Heather Conley.

According to reports, Elon Musk ordered the slowdown of Ukraine's Starshield defense systems. Nick Schifrin reports, and Amna Nawaz discusses how the world's richest man gained such power over U.S. security interests with Charles Galbreath, a retired Air Force colonel who focused on space operations during his 30-year military career and is now at the Air Force Association's Mitchell Institute.

To discuss the tensions between President Trump and Ukrainian President Zelenskyy, Geoff Bennett spoke with David Kramer. He held a number of senior positions at the State Department during the George W. Bush administration. He's now the executive director of the George W. Bush Institute in Dallas, Texas.