Novak Djokovic's father has insisted he was unwittingly caught up in a pro-Russian demonstration at the Australian Open but has decided not to attend his son's semi-final against Tommy Paul.

A video on a Russian activist's YouTube channel emerged on Thursday showing Srdjan Djokovic standing with a man holding a Russian flag with Vladimir Putin's face on it and wearing a t-shit bearing the Z symbol that demonstrates support for the war in Ukraine.