I want to know the answer to the following question:
When did the Russo-Persian War begin?
All the background I'm provided with is that "In the late 1820s, the parts of historic Armenia under Iranian control centering on Yerevan and Lake Sevan (all of Eastern Armenia) were incorporated into the Russian Empire following Iran's forced ceding of the territories after its loss in the Russo-Persian War (1826-1828) and the outcoming Treaty of Turkmenchay.". Is that enough to answer the question?