Russia runs German law system, it is just the results are so different that one has hard time to believe that it is the same system. The same with governance - German modeled, just again with very different results.

The Spanish is good contender, agree, though, German I think closer and historically provided more influence - there were no noticeable Spanish speaking, Spanish literature nor philosophy in Russia, while German speakers, German literature and philosophy were massively present.

The political system in Russia is closer to France if anything. But that's all on paper - the reality for both the justice system and the political one is obviously quite different and not in any sense German.

If we're talking about cultural influence, I'd also say that France had a lot more influence in that regard, especially literature-wise. French was a de facto standard "educated class" language for close to two centuries, with quite a few of the nobility learning it as their first language.

But, again, culturally Russia is by and large its own thing. The way I'd describe it is a European-style facade covering some unholy merger of Byzantium (the way it was understood in Muscovy, not necessarily how it actually was) and the Golden Horde. The latter part goes all the way back to the Grand Duchy of Moscow; the former, mostly to Peter the Great.