The first video is him saying he's going to the Ukraine to get to the bottom of what Joe Biden is connected to.  The second response video is a huge defamation episode on guliani saying he's going to go and basically meddle in the 2020 election by trying to hinder Joe bidens running with an investigation into money laundering and strong arming the goverment. The third, is him literally basically going "I'm not actually going to the Ukraine because I think it was a set up by enemies of the president, Annnnnnd I wasn't going to start an investigation because theres already been one for months." The final video is CNN saying it was a Russian trip and disregards all of it completely.