Eric P. Hamp in his 2012 Indo-European family tree, groups the Armenian language along with Greek and Ancient Macedonian ("Helleno-Macedonian") in the Pontic Indo-European (also called Helleno-Armenian) subgroup. In Hamp's view the homeland of this subgroup is the northeast coast of the Black Sea and its hinterlands. He assumes that they migrated from there southeast through the Caucasus with the Armenians remaining after Batumi while the pre-Greeks proceeded westwards along the southern coast of the Black Sea.
What subgroup does Hamp put the Armenian language in?
Pontic Indo-European