Two sentences from two different sources are showing me the way.

From NC talking about 1775 :

Most likely that following their defeat the remnants of the royal court at Tobolsk and its faithful troops fled to China, where they were warmly received by the Emperors of Manchuria, the distant relatives of the Hordian czars of Tobolsk,

 

From Wiki taking about one of the Admiral’s sons :

Another son, Ivan Samuilovich Greig (1776–1802), traveled to China but was never heard of again.

 

Oooooooh :o)