You might be interested in some earlier answers.

On what was happening in China in the time of the Antonines and Severans (by u/Dongzhou3Kingdoms):

• What was the political system of Han Dynasty China like preceding the Three Kingdoms Era? Governors acted as nominal vassals to the Emperor but openly waged war against each other. Why keep up the pretense of a functional government when everyone was practically independent?
• Leading Factors - Rise and Fall of the Han Dynasty

On Greco-Roman contact with India and China:

• Did Greeks during Alexander the Great knew about China?and vice versa? by u/EnclavedMicrostate
• Alexander the Great's invasion of India gets no mention in Indian sources, all our knowledge of it comes from Greek sources. Are records lost or did Indian historians consider it unimportant? by u/Trevor_Culley
• How long would it take for a piece of silk to travel from China to, say, Rome, via the silk road during the 1st Century AD. by u/Celebreth
• Ancient Mediterranean piracy was largely wiped out by the Romans in the first century BC. But what about Indian Ocean piracy? With the vast wealth of India, Rome and China crisscrossing the seas from Egypt to Malacca, was piracy a major issue in the region in antiquity? by u/toldinstone
• Did china and ancient rome know about each other? by u/Dongzhou3Kingdoms