Germany has no nuclear weapons of its own, but it stores 20 or fewer U.S. B-61 nuclear gravity bombs at Büchel air base, and maintains a fleet of aging Tornado fighter bombers to deliver them.
Shoigu said the documents he was signing in Minsk concerned the process for storing tactical nuclear weapons in Belarus
Naive question, but what are the concrete military and custody differences between both cases?
who has physical custody of the bombs? Host? US/Russia? mixed?
which chain of command do the custodians report to?
who has the launch codes and authority?
as far as is known, how many weapons of what type in both cases?
This is only for comparison of two very similar-looking phenomenon. How would a dispassionate third party compare them, by looking at the deployments themselves, rather than the larger political and military context around them (especially events since 2022)?
What it is not is asking for are claims like:
"Russia/US is very nice and wouldn't attack anyone".
"US/Russia is a warmongering threat and Russia/US needs those nukes for protection".
"Germany/Belarus is a US/Russian lackey"
Not all that interested in communicated generic nuclear doctrine either (unless it concerns specifically those hosted nukes). For now nukes are very much taboo and countries' pronouncements about their use tend to be heavily influenced by PR considerations.
What do we know about the similarities and differences in both cases of the conditions of those deployments? I realize that Russian move is recent and not much may be known yet. But they must have communicated something about what their intentions are, if only for internal/external PR reasons.