In this handout photo provided by the Ukrainian Presidential Press Office, Ruslan Ryaboshapka speaks to the media in Kyiv, Ukraine, Friday, Oct. 4, 2019. Ukraine's Prosecutor General said on Friday that his office is reviewing all the cases that were closed by his predecessors, including several related to the owner of a gas company where former Vice President Joe Biden's son sat on the board. (Ukrainian Presidential Press Office via AP)