China certainly threatens and influences overseas people who are publicly critical of the PRC. But I can't think of any example of assassination.Nah i think its important to let those traitorous loser factions know that hiding in the west isn't safe either. Just like Stalin/soviet union hunted down Trotsky.
Assassinating foreign based critics is much more common in Western "democracies" because they can't control the media. China doesn't need to kill anyone to silence them in domestic media