Nobody.
>Both regional powers, minor allies likely to join in early on. Indian SAARC / Afghanistan ties involve good chunk of middle East. China has NK & other nuclear allies.
>Russia has significant stake in both, will likely attempt some mediation attempt.
>US likely to get involved because 'murica
>Both have significant secessionist populations / regions. Will have to manage both primary conflict & rampant sedition.
>China has world's largest economy, will likely tank at the outbreak.
>War refugees / economic migrants from world economy crashing flood Europe (even more.)
To summarise, several unstable nuclear states involved in a hot war from the off, The world starves, US gets nuked & Europe gets culturally enriched to death.
South Americans inherit the Earth.
