According to the document, issued in fall 2021, the end goal is the formation of a so-called Union State of Russia and Belarus by no later than 2030.

The Union State already exists and has since 1999: https://en.wikipedia.org/wiki/Union_State

The Union State,[b] or Union State of Russia and Belarus,[c] is a supranational union consisting of Belarus and Russia, with the stated aim of deepening the relationship between the two states through integration in economic and defence policy.[6][7]

Western media reporting on dumb things to spread fear and propaganda, as always.