I'm a noob at IPA. How do you best write stress in IPA? I know stress always falls on the first syllable in Old Norse and other ancient Germanic languages, but in modern Russian (and Old East Slavic too, I think), stress is free and has no fixed rule. Stress in East Slavic languages can fall on any syllable and stress is so important that two words spelt the same can mean entirely different things depending on the stress. East Slavic languages also don't distinguish between long and short vowels which is why stress is so important.

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In modern Russian, the word дружи́на (družína) has stress on the syllable starting with the letter 'и́' (í); hence the acute accent. I assume stress also fell on the same syllable in Old East Slavic дрꙋжина (družina) but it's hard to tell since marking stress on vowels with an acute accent is quite a recent thing in Russian, Ukrainian and Belarusian orthography and many people today often don't write an acute accent in informal everyday writing.