The spread of Russian in Ukraine fits this model (coercion to establish dominance, then continued spread without coercion) very well. Urban areas in the East and Center became Russian-speaking through Soviet measures like mixing nationalities at work/army to force them to use Russian. There were other coersive measures like the central planning not providing not enough Ukrainian media (only folk music programs on TV for example) and limiting the classes available in Ukrainian in some regions.

Now the "language of inter-nationality communication" is so entrenched, that Ukrainian needs government support to incentivise media and businesses to use it. As everyone understands Russian nowadays, and few people know English, companies that serve the CIS market actually promote Russian better than the government promotes Ukrainian.

To talk about the elephant in the room, note that the politics don't correlate perfectly with the language situation on the ground - on one hand there are quite a few Russian-speakers that don't want Russian as an official language and also plenty of pro-Western people want Russian to be co-official.