My question is inspired by this one.

Large corporations or even states are signing contracts during peace periods. However, it happens that wars can be declared (sic...). This is the case of the Ukraine / Russia war and the impact on Gazprom contracts.

My questions are the following:

• Do we have significant examples of major breaches of contracts between states (or large corporations of states) in history induced by wars, especially during WWII?
• What were the arbitration attempts to resolve the issues?
• Is there examples of successful negotiations (arbitrations, litigations...) that happened after the close of the wars?