> … learning Russian… explain the patterns… such an app

Non-native Russian speaker here. In the past, I cobbled together some scripts that use the spaCy Python module with the larger of the two Russian modules to provide context-aware lemmatization and grammatical tag extraction.

On the whole, though, my biggest gains in Russian were in letting go of the need to analytically deconstruct the inflections and instead build up a mental library of patterns (and exceptions) in my head through use.

EDIT: I mean context within a sentence, not a broader meaning.