Here's some basic intel on Russian tactical nukes.

https://www.washingtonpost.com/business/2023/04/26/how-russia-has-revived-fears-of-nuclear-war-in-europe-quicktake/7bf8089c-e418-11ed-9696-8e874fd710b8_story.html

Do you get the CSIS briefing newsletters? I find them very helpful.

The Center for Strategic and International Studies (CSIS) is a bipartisan, nonprofit organization founded in 1962 and headquartered in Washington, D.C. It seeks to advance global security and prosperity by providing strategic insights and policy solutions to decisionmakers.

https://www.csis.org/

It's also free, which is always a good thing. My subscription fees to info sources were just over $1500 last year.