Yeah, Ukrainians and Russians are still brothers, even though they're a bit at odds right now. It's a bad thing... just like in the times of feudal fragmentation. Kyiv is the mother of Russian cities :p This was after our caravans were raided by the Golden Horde, and the Livonian Order (Lithuania) took control of these territories... and in general, Kyiv was gradually forgotten due to endless conflicts. But Moscow started to curry favor with the Khan, and in return, it received the right to collect tribute and began to prosper. In general, this process is still happening, it seems that the mentality is still from those times.
Added 4 minutes later
And Lithuania and the Livonian Order are two different things, believe me.