I know Russia has no extradition treaty with the US, but do they never extradite for any reason? Hmm, from what I'm reading on Quora "The Russian Constitution protects its own citizens from extradition to a foreign country." Interesting, I didn't know that.
Not really. If I murder someone while visiting another country it makes sense I'd face justice in the foreign country, where all the witnesses are. Especially if the legal systems are similar.
It becomes more of an issue where one country doesn't trust the legal system of another country.