Where does “протиріччя” come from?

протиріччя (Ukrainian) comes from Russian противоре́чие, from Russian речь, from Proto-Slavic rěčь, from Proto-Slavic rěk-, from Proto-Slavic -ь, from Proto-Indo-European -is — Forms nouns from verbs.

Ancestry of “протиріччя”, step by step

протиріччя traces back through two separate lines of ancestry.

via Russian противоре́чие

StepLanguageWordMeaning
1Russianпротиворе́чиеcontradiction (act of contradicting)
2Russianречьspeech, language; discourse, talk, conversation;...
3Proto-Slavicrěčьspeech
4Proto-Slavicrěk-
5Proto-SlavicForms nouns; From adjectives; From participles
6Proto-Indo-European-isForms nouns from verbs

via Ukrainian річ

StepLanguageWordMeaning
1Ukrainianрічthing, object
Every word from Proto-Indo-European -isEvery word from Proto-Slavic Every word from Proto-Slavic rěk-