Excuse the retards above
While Baikonur has historically been Russia and the USSR's main launch pad, it's not their only one. They also have Plesetsk (located near Arkhangelsk, a few hundred km east of St petersburg and Finland), which has been their main site for launching spy sats into polar orbits since forever, and Vostochny, which is located in the russian far east next to the border with China, and which is supposed to be the replacement for Baikonur, it opened in 2016 but has had trouble ramping up since.
Kazakhstan is not seizing all of Baikonur, but only the russian facilities on an old launch pad which used to launch ukrainian rockets and which has since been renovated to launch a new Russian rocket which would replace Soyuz (it's called Soyuz 5 but it's a completely different rocket), however there's some shady stuff and corruption and Kazakhstan has had enough and stopped cooperation on this particular project, but the rest of Baikonur will still be used to launch Soyuz for the next 10 years at least.
As for the general future, the #1 priority right now for russia is to increase satellite production, russia historically made good rockets and good crewed spacecrafts but poor satellites and probes, and with Starlink giving the ukrainian an advantage on the battlefield and its chinese and european equivalent coming soon, they're desperate at making a similar constellation of satellite. However this will take years.
Their historical priority is continued crewed space presence, they'll keep servicing the ISS until 2030 and plan on launching a small station (smaller than Mir) named ROSS (POCC) in 2028, one of the module is mostly done but there are funding uncertainties.
They also have a lunar program, they'll launch Luna-25 this summer, it'll be the first spacecraft to land on the moon's south pole if everything goes right, beside that they've also recently signed agreements for a lunar base with China in the 2030s.