If we take international law as a basis for our arguments, then Armenia has illegally occupied territories that de jure belong to Azerbaijan [1], brutally massacred civilians [2], destroyed and looted cities [3][4], and left more than 700,000+ people homeless [5].
Armenia is the aggressor here.
[1] https://en.wikipedia.org/wiki/List_of_United_Nations_Securit...
[2] https://en.wikipedia.org/wiki/Khojaly_massacre
[3] https://www.meydan.tv/en/article/ghost-town-of-aghdam/
[4] https://www.reddit.com/r/azerbaijan/comments/jumrv3/on_the_l...
[5] https://reliefweb.int/report/armenia/armeniaazerbaijan-myths...