Russian is a type of Language. Language is related to Country. 
Conversion is a synonym of Transition. Transition is related to Become. Become is related to Grow. Grow is the opposite of Diminish. 
Russian --IsA--> Language <--RelatedTo--> Country 
Conversion <--Synonym--> Transition <--RelatedTo--> Become <--RelatedTo--> Grow <--Antonym--> Diminish 