Honest questions / headscratchers (spoilers)

1. Were they after money, diamonds, or stamps?
2. Why did Regina agree to risk her life to help retrieve the money (or diamonds, or stamps) for Tim Robbins' character?
3. Why didn't Regina call the US embassy or anyone to verify that Tim Robbins' character is legitimate?
4. Who was the uniformed lady getting dressed at the very beginning (and also with Joong-Hoon Park's character during the credits)? How did either of these scenes relate to the story?
5. Who was the lady in the veil that Regina saw twice and who appeared to recognize Regina? How did either of these scenes relate to the story?

Thank you