Two excerpts. The rest of the article is what one would expect given the source.
[T]he Zangezur corridor [is] proposed by Azerbaijan to connect the rest of the country with its Nakhchivan enclave via Armenia’s southern Syunik region. According to Iranian hardliners, the crossing could be a gateway for Israel and NATO’s direct entry into the Caucasus and, therefore, would violate Armenia’s territorial integrity and also threaten Iran.
Tehran’s main concern with Azerbaijan is the increasing military capabilities provided by its patrons Israel and Turkey. This is changing the geostrategic balance to Iran’s detriment. Tehran is also worried that if Azerbaijan succeeds in imposing the Zangzur corridor on the Armenian government, Baku could easily connect to Turkey, Israel, and the European Union by land, thus, excluding Iran from its transit equations. Iran sees this as further expanding the presence of Israel and NATO on its borders and undermining Iran’s relations with Armenia.