Also it allows Russia to get around treaty limits, besides counting strategic nukes as “tactical” ones, and basing nuke launchers in Kazakhstan and other “former” Soviet Republics.
A treaty that Russia also never adhered to. Russia likely has 4-6k strategic nukes, and 10k+ “tactical” nukes, many of these with strategic yields. Add China’s 3k, and the likely basing of nukes in North Korea by those powers.