Modern Russian has no difference between paternal/maternal aunt/uncle (though there are apparently archaic forms that denote the difference that no one uses).
On the other hand, it has different words for "wife's mother" and "husband's mother", which in English are both "mother-in-law". Similar for the "father-in-law" relationship: different words for "wife's father" and "husband's father". Similar for sibling-in-law relationships.
(Of course there's the open question of whether Russian would count as "East" or "West".)
On the other hand, it has different words for "wife's mother" and "husband's mother", which in English are both "mother-in-law". Similar for the "father-in-law" relationship: different words for "wife's father" and "husband's father". Similar for sibling-in-law relationships.
(Of course there's the open question of whether Russian would count as "East" or "West".)