When Yovanovitch returned in 2016, it was as the top U.S. diplomat. She was inheriting a tough job. By then, Russia had invaded Ukraine, annexed Crimea and encouraged separatist movements.

During her confirmation, Yovanovitch said she was open to providing military aid to Ukraine, a stance that had bipartisan support. She also set a goal to keep promoting civil society.

"Building capacity within the journalistic community, within civil society so that they themselves can get their own good news out and they themselves can counter the Russian propaganda efforts," she told the Senate Foreign Relations Committee.

A "reserved" and "cautious" diplomat

This commitment would cause many in Ukraine's civil society to look favorably on Yovanovitch.

Daria Kaleniuk, executive director of the Kyiv-based Anti-Corruption Action Center, described the ambassador as "very supportive" to the anti-corruption reforms in Ukraine.

Other Ukrainians who dealt with the ambassador recall her as a professional who worked hard to represent U.S. policy. Journalist Nataliya Gumenyuk says Yovanovitch "was a good diplomat, but very, very reserved."

"She was extremely cautious," Gumenyuk says. "She would never say anything beyond what the diplomat can say."

In November 2016, the new ambassador invited civil society activists and others to an event to mark America's presidential election. Kaleniuk, who was in attendance, said some in the room were dismayed by Trump's election because he was viewed as sympathetic to Russia. But the U.S. ambassador delivered a reassuring message, says Kaleniuk.

"The United States will continue being the partner and supporter of Ukraine and we congratulate our democracy," Kaleniuk says, recalling Yovanovitch's message that night. "She didn't express any frustration."

The story, which a second attendee at the event confirmed to NPR, would be characteristic of a career diplomat like Yovanovitch. Unlike some ambassadors, who are friends or supporters of a president, supporters say she served whoever was in the White House.

A growing cast of enemies

Yet not everyone in Ukraine was pleased with her. Some Ukrainians found her narrow-minded, bureaucratic and hard to reach.

Then there were the two associates of Giuliani, the men arrested this week.

Fruman and Parnas, both U.S. citizens who had been born in former Soviet republics, had business interests in Ukraine. Federal prosecutors allege they wanted to please Ukrainian officials who disliked the ambassador.

According to the indictment, they sought to gain influence in the U.S. government and allegedly made hundreds of thousands of dollars in illegal campaign contributions.

Their efforts appeared to pay off in 2018. They donated to Pete Sessions, who was then a senior member in the House but lost his reelection bid in 2018. While the congressman is not named in the indictment, details from the document and Federal Election Commission records outline the ties between Fruman, Parnas and the Texas Republican.

Sessions wrote a letter to Secretary of State Mike Pompeo demanding that the ambassador be dismissed.

Sessions made an allegation that was toxic in the Trump administration: that Yovanovitch had criticized the president. He alleged that she showed "disdain for the current administration."

After the arrest of Fruman and Parnas, Sessions admitted having met with the two men, but he denied that they had caused him to write the letter. "At no time did I take any official action after these meetings," he said in a statement.

Yovanovitch was not fired after Sessions' complaint, but worse was coming for her. Kaleniuk, the Ukrainian anti-corruption activist, says the ambassador had another enemy: Ukraine's then-prosecutor general, Yuri Lutsenko.

"Ambassador Yovanovitch was a friend for civil society in Ukraine," she said. "This is what Yuri Lutsenko and other corrupt officials in power did not like."

Lutsenko was a vital figure in what happened next. Civil society groups called him corrupt. They recently summarized their accusations in a formal complaint, which they sent to the U.S. Treasury Department and that NPR has obtained. The groups affixing their names to the letter include Kaleniuk's Anti-Corruption Action Center.

In the document, Lutsenko is accused of enriching himself and targeting anti-corruption investigators.

Yovanovitch was focused on corruption. On March 5, she gave a speech alleging that Ukraine's government was backsliding in its efforts against corruption. "It is increasingly clear," she said, "that Ukraine's once-in-a-generation opportunity for change has not yet resulted in the anti-corruption or rule of law reforms that Ukrainians expect or deserve."

Attacks in conservative media

Soon after this speech, Lutsenko struck back, suggesting the U.S. ambassador was really the corrupt one. On March 20, he spoke to Hill TV and claimed that Yovanovitch had given him a list of people not to prosecute.

The State Department denied the story, and Lutsenko later recanted his claim, but it had already spread.

The very night of the Hill TV report, another accusation against the ambassador reached Sean Hannity of Fox News. On his program that night, Hannity interviewed Joseph DiGenova, a lawyer linked to Trump. DiGenova said that the ambassador "has bad-mouthed the president of the United States." NPR asked DiGenova where he got that information, but he declined to say.

On March 24, Donald Trump Jr. attacked the ambassador on Twitter. "We need... less of these jokers as ambassadors," the president's oldest son wrote. Then in April, Hannity interviewed the president himself, and Trump made a vague statement that conservative media reporting out of Ukraine "sounds like big stuff."

Weeks later, Yovanovitch was called home from her job, before the end of her assignment.

An ambassador removed

Why would these toxic claims go so directly from Ukraine to people around the president? Here is at least part of the answer: Ukrainians who opposed her were also sources for the president's personal lawyer.

Giuliani was on a months-long search for political dirt in Ukraine to help Trump. The two indicted businessmen were helping Giuliani find information.

Lutsenko, the prosecutor accused of corruption, met Giuliani at least twice, according to the whistleblower report filed against the president. The president's lawyer developed a negative view of the U.S. ambassador, later saying on CNN that she stopped him from interviewing witnesses in his search for politically damaging information against former Vice President Joe Biden. His son Hunter had served on the board of a Ukrainian gas company.

In the end, the removal of Yovanovitch may not have helped the president or his lawyer. Her replacement was another career diplomat, Bill Taylor, who now has an indelible place in the impeachment inquiry.

In September, Taylor sent text messages, which are now public, in which he said, "I think it's crazy to withhold security assistance for help with a political campaign." Trump did withhold military aid to Ukraine, before later asking the country's president to investigate Biden for acts in Ukraine. Those efforts are now at the center of the impeachment inquiry.

Correction: October 11, 2019 12:00 am — In the audio of this story, as in a previous Web version, we refer to some text messages from diplomat Bill Taylor as having been sent in July. Those messages were sent in September.

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