Ukraine to investigate possible Yovanovitch surveillance

• The FBI has been invited to participate in the investigation, AP reports.

The big picture per Axios' Alayna Treene: If anything comes of these investigations, it could give Democrats new ammunition as the Senate proceeds with its impeachment trial.

What they're saying: In a statement, the ministry said, "Ukraine's position is not to interfere in the domestic affairs of the United States of America," but the allegations of illegal surveillance could be a violation of Ukrainian and international law, per NBC.

Flashback:

• Yovanovitch testified in November that she was the subject of a smear campaign spearheaded by Giuliani that led to her firing.
• Former Vice President Joe Biden's son, Hunter, was a director of Burisma Holdings. The impeachment inquiry started following allegations that Trump threatened to withhold aid from Ukraine if they didn't investigate Burisma.

Go deeper: Yovanovitch urges Ukraine probe after Parnas phone records release