Is Germany really held together by force? Was East Germany invaded by West German army? Because that's where the difference comes from: Russia is held togethe

Is Germany really held together by force? Was East Germany invaded by West German army? Because that's where the difference comes from: Russia is held together purely by military - not by economy, or culture, or language. Without military force, Russia will fall apart - same way as it did 20 years ago, and for the same reason.