Not sure how accurate this story (or at least it’s headline) is. Counterpoint - US DOJ is the ONLY government putting pressure on the current Malaysian Prime Minister for the 1MDB scandal (by freezing 1 billion dollars of the PMs assets in the US) - (despite numerous other nations investigating this scandal within their jurisdictions - incl Singapore, Switzerland, UK, HK, more). PS. the 1MDB scandal represents more than any of the kleptocrats mentioned in this article combined (by an order of magnitude) - perhaps the DOJ only focuses on big fish.
DOJ Filing - https://www.justice.gov/opa/file/877166/download