In a significant escalation of tensions, Iran executed Yasin Hosseinzadeh, the man convicted for the 2023 attack on the Azerbaijani Embassy in Tehran, which resulted in the death of the embassy's head of security. The Iranian judiciary announced the execution on Wednesday, noting that Hosseinzadeh's motivations were rooted in personal issues, a claim refuted by Azerbaijani President Ilham Aliyev who labeled the incident a terrorist attack, as reported by Mizan news outlet.

The conflict between Iran and Azerbaijan has been historically fraught, stemming from Iran's support of Armenia in its territorial disputes with Azerbaijan. In contrast, Iran has exhibited unease toward Azerbaijan’s alignment with Turkey and its close ties with Israel. This attack intensified existing strains, prompting Azerbaijan to close its embassy in Tehran and withdraw diplomatic personnel temporarily.

After a trial in which Hosseinzadeh expressed that he attacked the embassy under the belief that his estranged wife was inside, he was sentenced to death, a verdict later upheld by Iran's supreme court in January. However, a recent meeting between Iranian President Masoud Pezeshkian and President Aliyev suggested signs of warming ties, as they both declared improvement in their bilateral relationship. Joint military exercises between the two countries' militaries took place this past week, signaling potential reconciliation.

Following the attack, Azerbaijan resumed diplomatic operations in Tehran last year, opening a new embassy building. Although security improvements were claimed, Azerbaijan's foreign ministry remained silent regarding the attack itself when announcing the facility's reopening. The complicated interplay of personal grievances and broader geopolitical conflicts continues to reflect the challenges faced by both nations.