What the hell are you smoking man? While I do not want to question your knowledge of borscht, Kyiv, as in the capital of Ukraine, was founded around 480CE, which is a bit more, than 30 years ago, and way before anyone ever knew anything about russians.
This is a pr0n forum. Don't make this another "russian world" simping thing.
Bro. You believe in the legends that are propagated to you there in Ukraine. I have been interested in world history for quite a long time. Even Wikipedia will tell you that the year 480+ is just according to a legend that is now being actively pushed to “people” like you.
The city does not have an exact founding date. Because there is no REAL record of this. Chronicles begin in 882, from the founding of Kievan Rus. Until 882, it was an ordinary feudal state with the capital "Kyiv" (which was founded by the Poles and a number of Eastern Slavs) in which almost all Slavic peoples lived at that time.
If we are talking about Borscht right now. The first potatoes, IN PRINCIPLE THE FIRST IN HISTORY, were brought to Europe around 1550-1560, because borscht is made with potatoes. I don't remember the exact date. At this time, Kyiv was part of the Principality of Lithuania. I heard that the Lithuanians boasted that they invented borscht, the Poles also say so, in Europe they say that this is an invention of ancient Rome (which is, of course, nonsense). In general, this is the national dish of all Eastern Slavs and some others.
And the crappiest of borscht recipes is the Ukrainian one. A tasteless, fatty sup that tastes like vomit.