The Mueller report, however, exonerated Trump. The Ukraine RNC plank was not changed at the behest of Trump or Russia https://www.cnn.com/politics/live-news/robert-mueller-report-public/h_d3e1046ae9758f70a8cf219f25bae5eb
"Since at least May 2019, Giuliani has been pushing for Volodymyr Zelensky, the newly elected president of Ukraine, to investigate Burisma, as well as to check if there were any irregularities in the Ukrainian investigation of Paul Manafort. He said such investigations would be beneficial to his client, Trump, and that his efforts had Trump's full support.Giuliani's efforts began as an attempt to provide cover for Trump to pardon Manafort, who had been convicted of eight felony counts in August 2018. On May 10 Giuliani canceled a scheduled trip to Ukraine where he had intended to urge president-elect Zelensky to pursue inquiries into Hunter Biden, as well as whether Democrats colluded with Ukrainians to release information about Manafort. Giuliani claimed he has sworn statements from five Ukrainians stating they were brought into the Obama White House in January 2016 and told to "go dig up dirt on Trump and Manafort", although he has not produced evidence for the claim. Giuliani asserted he canceled the trip because he had been "set up" by Ukrainians who objected to his efforts and blamed Democrats for trying to "spin" the trip. Giuliani met with Ukrainian officials to press the case for an investigation in June 2019 and August 2019. ". https://en.wikipedia.org/wiki/Trump%E2%80%93Ukraine_controversy
Trump has a history of catering to Russia on Ukraine Russian foreign policy goals.. He has proposed lifting sanctions for Russia's grab of Crimea and the stealth grab of eastern Ukraine. https://www.nytimes.com/2017/01/27/world/europe/theresa-may-britain-trump.html and he has proposed removing the mutual defense portions of NATO, the main barrier to Russian incursions into the USSR's former satellites. https://www.politico.com/newsletters/morning-defense/2018/07/12/trump-meets-with-afghanistan-war-partners-277146. https://www.nytimes.com/2019/01/14/us/politics/nato-president-trump.html . All of this fits neatly into making Russia great, but not in the interest of the US and our allies.