If:
* you start in North America and
* your status is StarGold (Premier Executiv or 1K with UA) and
* your stop in Germany is < 24 hours and
* you check-in your luggage right away in North America through to Moskwa
* (it doesn't matter if the ticket is eco, business or first, award or not)
then your check-in luggage allowance on LH flights is: three pieces (each one not over 32kg).
I hope that you are aware of possible import restrictions (and duties to be paid) at immigration in Russia.