Germany could interfere if they wanted to, Kimble just isn’t worth the trouble (few people would be).
There are things you can do, see how Russia is handling these things when their VIPs are targeted for extradition.
Ordinary citizens with no high up political or IC connections never receive any significant state aid in extradition cases no matter what passport they hold. At best your embassy might refer you to a lawyer or help you arrange money transfer from your home country.