Just a random thought I got recently.Like the massive migrations that happened because of the collapse, like were there people in China or close to China who migrated towards west? And was it in such big numbers that Chinese people were theorising on what is happening somewhere west?
Also I'm quite sure that silk got to Rome, would that have effected directly to the economy of China?
I asked this question a few years ago
https://www.reddit.com/r/AskHistorians/comments/3oc1cz/did_ancient_china_know_about_the_fall_of_the/
The top comment by /u/Ambarenya states that the Chinese were at least vaguely aware of the Roman Empire's existence and had at least some limited communication. After a while the Chinese noticed that the limited communication had faded down to barely a whisper, giving the impression that something had happened to the Romans. By the 7th century the Chinese are at least aware of the Byzantine empire, which they identify as a successor to the now defunct Roman Empire