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Russia got it from Mongolia, so it uses the “chai” variation. Move just a tiny bit West though and Poland got it from France, which got it via sea routes, therefore Poland uses the “te” variation, even though a lot of the culture of drinking tea in Poland has been influenced by Russia, with boiled tea being a thing in more eastern parts, and variations on that with citruses and honey being very popular (even becoming more popular today). Curiously, contrary to the word for tea, Polish word for kettle borrows from Russian influence – “czajnik”, where the first syllable comes obviously from “chai”.