American Enterprise Institute (AEI)

The provided news articles do not mention the American Enterprise Institute (AEI). Therefore, I cannot provide a summary about AEI based on the given information. The articles focus on two separate events: the lack of territorial gains by Russia in Ukraine during March, as reported by the Institute for the Study of War (ISW), and the re-election of Kim Jong Un as the leader of North Korea's ruling party, as announced by the Korean Central News Agency (KCNA). Without any mention of AEI in these articles, it's impossible to determine why they would be newsworthy, what recent events or developments involve them, or their current relevance or significance in the context of these specific news items.