J2-L25 is the second most frequent type of J2 in Armenia (~5%). It is found from Central Asia, Iran to Europe, North Africa. It is rare in Caucasus. The age of L25 is 9100 year old. It seems all modern L25 descend from one Neolithic farmer who lived in NW Iran. The oldest L25 we have is from Tepe Hissar (5000 year ago) in North Iran. L25 was prominent among Iran related farmers but was completly absent among Anatolian and Levantine related farmers. It has three important subclades. Lets see their histories.
PF4888, L243 A relatively rare branch found in Near East and Europe. No ancient DNA yet.
F3133 This is the biggest subclade of L25. It migrated to East from NW Iran. It was found in ancient South Central Asia. In Bronze Age BMAC culture. It was also found in East Iran, Jiroft culture. In most likelihood it was present in Harappa but still no prove of that. F3133 has good presence in Iraq. Based on that it was suggested that it can be a Sumerian marker, but still no hard evidence of that. After the arrival of Steppe people in Central Asia (Andronovo) the Proto Iranian community formed as a mixture of Andronovo and BMAC which resulted in the integration of some F3133 in Proto Iranian community. Indeed few cases of F3133 were found among ancient Scythians and Saka. But most of Armenian cases of F3133 do not belong to this Scythian branches and their presence in Armenia is probably old.
Z438, Z387, L70 This branch has a very unique history. It is mostly European and East Med. But this is not the result of farmer's migration. Rather a Late Bronze Age migration from Anatolia to Italy and subsequent expansion with Roman Empire. How Z438 appeared in Anatolia is not clear yet. It could have migrated from North Iraq/South Arm. Highland to Anatolia in Late Chl.
The age of L70 subclade is 3800 but the starcluster starts at 3400 years ago which can be linked with Late Bronze Age collapse in Near East and migrations of various Sea People. A paper from ancient Rome has found a signal of migration from Anatolia (ancient Armenian samples were used as proxy ) in Iron Age during the Early Republican era. But L70 was not present in few aDNA published in this paper. More aDNA is needed to solve the puzzle of L70. The story of L70 almost certainly is not related to the origins of Etruscans.
The Y17949 parallel to L70 is unrelated to Sea People story.