This is the 9822nd most frequent Russian word.
ясиноватскому
The word "ясиноватскому" is the dative singular form of the adjective "ясиноватский," which means "related to Yasinovataya," a town in Ukraine.
The word 'ясиноватскому' here is in the dative case, singular masculine, describing the recipient of the action.
Я передал письмо ясиноватскому другу.
I handed the letter to a friend from Yasinovataya.
In this sentence, 'ясиноватского' is in the genitive case, singular masculine, specifying what district the issues are relevant to.
Мы обсуждали проблемы, важные для ясиноватского района.
We discussed issues important for the Yasinovataya district.
Here, 'ясиноватскому' is in the dative case, singular masculine, indicating the indirect object or dedication of the monument.