WW2, depends where you were
If you lived in Nanking it started long before 1939
As for Asymetric warfare, well mao was fighting the Japanese with a guerilla force in 35, the Spanish "civil" war had nazi and Facist govts support against a ragtag crew of volunteers, Ethopia was facing the asymetic expansion of the Italian colony in Eritrea - I do feel that what is effectively a colony in Palestine run by refugee Europeans is fighting similar colonial type war with collective punishmants the massive concentration camp (in the Boer War sense) that is Gaza, extra-judiclial killing, racial religious barriers etc and the whole State predicated on the ethnic cleansing from the late 40s onward.
This is not yet WW#, but is VERY much like 36/37
Also note the small wars sprining up all over, the UN no has no authority, well the USA has gelded the thing, not even moral, as the Colonists in Palestinians feel free to kill them with impunity, they are ignored in Darfur, killed in Somalia, Iraq, etc
When big nations behave like shits, little ones are free to get away with it.
Nobody gives a flying fuck except for what can I get away with.
So, we could be very close to the whole lot going off in the next couple of years or so.
I dont feel very cheery about this
Cepting this time, we are all much more intermingled than we were
It doesn't seem to have bred understanding, more like intensyfied mutual distrust.
No, WW3 not quite yet, but if it happens, there will be civil war in it too
PS Haile Selassies speech to the League of nations as his country was being invaded by Italy makes itragic but informative reading, the parallels with today are astonishing:
http://www.mtholyoke.edu/acad/intrel/selassie.htm