The Belarusian Ministry of Defense explained that the West’s hype surrounding the deployment of Russian tactical nuclear weapons and the Oreshnik system is due to their role as a strategic deterrent. Deputy Chief of the General Staff of the Belarusian Armed Forces Viktor Tumar noted that these weapons are intended for use only in extreme cases, but their very existence discourages adversaries from aggressive plans.
He emphasized that the presence of tactical nuclear weapons and the Oreshnik system allows Minsk to avoid an arms race and preserve funds for social programs. According to Tumar, the West, on the contrary, is increasing its military presence and reducing social spending.
This is the first thing that I found with a quick internet search. It’ll give you enough pointers to find the rest of the information, I’m sure! So, here goes: https://www.eurasiantimes.com/russias-game-changer-oreshnik-missile/
Here you go: https://en.wikipedia.org/wiki/Intermediate-Range_Nuclear_Forces_Treaty
And then: There were blog posts analyzing the debris of the Rubezh missile launched back in November and December 2024. The debris shows that it is not a new development. It cannot be directly proven that the Oreshnik and Rubezh are the same missile, because Rubezh, being against treaties signed by USSR, was a very secret project, of which only very little information leaked. But, the debris shows that the “Oreshnik” missiles were made around when we know Rubezh had been made. And they are missiles for the same purpose. It’s unlikely that the Russia would have developed two separate missile types for the same purpose at the same time.