A Ukrainian serviceman looks through a periscope at his position on the fronline against Russia-backed separatists, not far from Donetsk, Ukraine, on Thursday. Anatolii Stepanov/AFP via Getty Images hide caption
Volodymyr Zelenskiy
Ukrainian President Volodymyr Zelenskiy speaks during a joint news briefing with Polish President Andrzej Duda in Kyiv, last month. A spokeswoman for Zelenskiy says that he has been hospitalized for COVID-19. Valentyn Ogirenko/AP hide caption
A gunman seized this bus and took 13 hostages in the city center of Lutsk, some 250 miles west of Kyiv, Ukraine, on Tuesday. Pavlo Palamarchuk/AP hide caption
Secretary of State Mike Pompeo (left) and Ukrainian President Volodymyr Zelenskiy arrive for a joint news conference in Kyiv, Ukraine, on Jan. 31. Sergei Supinsky/AFP via Getty Images hide caption
Lev Parnas (left) says text messages last year between him and congressional candidate Robert Hyde about surveilling former Ambassador Marie Yovanovitch were taken out of context. But Ukrainian police are investigating the allegations. Al Drago/Bloomberg via Getty Images hide caption
Ukrainian President Volodymyr Zelenskiy, French President Emmanuel Macron and Russian President Vladimir Putin arrive for a meeting on Ukraine with German Chancellor at the Elysee Palace on Monday in Paris. Alexey Nikolsky/SPUTNIK/AFP via Getty Images hide caption
Ukrainian President Volodymyr Zelenskiy visits a military unit in Ukraine's Donetsk region on Friday. Ukrainian Presidential Press Office via AP hide caption
The Stakes For Ukraine Are High In Monday's Summit Between Putin And Zelenskiy
U.S. Ambassador to the EU Gordon Sondland on Capitol Hill on Oct. 17. Sondland will give much-anticipated public testimony Wednesday in the impeachment inquiry of President Trump. His story has changed since he first testified last month. Pablo Martinez Monsivais/AP hide caption
Gordon Sondland Returns To Impeachment Inquiry As A Key Witness With An Updated Story
President Trump and Ukrainian President Volodymyr Zelenskiy shake hands during a meeting in New York on Sept. 25, on the sidelines of the United Nations General Assembly. Saul Loeb/AFP via Getty Images hide caption
Volodymyr Zelenskiy enters a hall in Kyiv on March 6 to take part in the taping of the television series Servant of the People. His role on the show was as a fictional president of Ukraine. Sergei Supinsky/AFP/Getty Images hide caption
How Ukraine's President Wound Up In The Middle Of The Trump Impeachment Inquiry
Energy Secretary Rick Perry announced last week that he will leave his position by the end of the year. Perry urged President Trump to make the July phone call to Ukrainian President Volodymyr Zelenskiy that's at the heart of the impeachment inquiry. Jacquelyn Martin/AP hide caption
How Rick Perry Became A Key Figure In The Trump Impeachment Probe
Former White House adviser on Russia Fiona Hill leaves the Capitol on Monday after testifying before lawmakers as part of the House impeachment inquiry into President Trump. Manuel Balce Ceneta/AP hide caption
Ukrainian President Volodymyr Zelenskiy speaks with journalists in Kyiv, Ukraine, on Thursday. Efrem Lukatsky/AP hide caption
After Trump Call, Ukraine's Zelenskiy Gambles On Russia Peace Push Without U.S. Help
National security lawyer Mark Zaid says a second whistleblower with direct knowledge of President Trump's call with the president of Ukraine has been interviewed by the intelligence community's inspector general. Nikki Khan/The Washington Post via Getty Images hide caption
Kurt Volker, former U.S. special envoy to Ukraine, arrives for a closed-door interview with House investigators on Thursday. House Democrats are proceeding with the impeachment inquiry of President Trump. J. Scott Applewhite/AP hide caption
Secretary of State Mike Pompeo discussed the phone call between President Trump and Ukrainian President Volodymyr Zelenskiy during a news conference in Rome on Wednesday. Alberto Pizzoli/AFP/Getty Images hide caption
Secretary of State Mike Pompeo Confirms He Was On Trump's Call With Zelenskiy
Ukrainian President Volodymyr Zelenskiy smiles after meeting United Nations Secretary-General António Guterres during the 74th Session of the General Assembly on Thursday in New York. Timothy A. Clary/AFP/Getty Images hide caption
Ukrainian President Volodymyr Zelenskiy speaks at the "Servant of the People" political party's headquarters after the parliamentary elections in Kiev, Ukraine, on Sunday. NurPhoto/NurPhoto via Getty Images hide caption
New Ukrainian President Volodymyr Zelenskiy took his oath of office and delivered an inaugural speech in which he announced the dissolution of parliament in Kiev. Anadolu Agency/Getty Images hide caption