I want to know the answer to the following question:
When are most of the problems created that might result in an otherwise valid treaty being rejected as a binding international agreement?
All the background I'm provided with is that "For example, the serial Japan-Korea treaties of 1905, 1907 and 1910 were protested; and they were confirmed as "already null and void" in the 1965 Treaty on Basic Relations between Japan and the Republic of Korea.". Is that enough to answer the question?
Answer: no