Political consultant Daniel Rabin takes the stand to speak about his work in Ukraine

From CNN's Katelyn Polantz

Around 9:50 a.m. ET, Daniel Rabin -- a political TV ad consultant -- was the first witness to take the stand on Day 2 of the trial.

Rabin is largely speaking about his work in Ukraine with Manafort for former Ukrainian President Viktor Yanukovych and his political party, the Party of Regions.

Rabin previously worked alongside Manafort and Tad Devine, who testified yesterday, also about Manafort's work in Ukraine.

Before questioning began, prosecutor Greg Andres told the judge the witnesses were testifying so they could establish for the jury the extent of the work Manafort did in Ukraine, up until Yanukovych's ouster in 2014.

Yanukovych has since fled to Russia.

Rabin, whose work like Devine's has largely been for Democrats in the US, is more soft-spoken on the stand than yesterday's witness, his former colleague.