Give me 4 jeopardy questions about Challenges facing East Asia that go from medium to extremely hard

1. Medium: This country, located in East Asia, faces significant challenges in managing its rapidly aging population due to low birth rates and a declining workforce. What country is it?

2. Hard: This East Asian country is highly susceptible to frequent natural disasters, including typhoons, earthquakes, and volcanic eruptions, which pose significant challenges for infrastructure development and disaster preparedness. Name the country.
3. Very hard: This autonomous region in East Asia faces challenges in maintaining its unique cultural identity and political autonomy amid increasing influences from mainland China. Can you identify this region?
4. Extremely hard: Known as the "Hermit Kingdom," this East Asian country has endured long-standing challenges including political isolation, economic stagnation, and widespread poverty. Can you name this reclusive nation?