New Delhi, June 26 -- Iran's Supreme Leader Ayatollah Ali Khamenei on Thursday said US President Donald Trump attacked Iran because he needed to do 'showmanship' and warned America against any further attacks on his country as he made his first public comments after the ceasefire between Iran and Israel.

Speaking in a video broadcast on Iranian state television, his first appearance since June 19, Khamenei said any attack on Iran would come "great cost".

The US had only interfered in the war between Iran and Israel because "it felt that if it did not intervene, the Zionist regime would be utterly destroyed", Khamenei told his viewers.

The US had "achieved no gains from this war", Khamenei said.

He declared that Iran was victorious in ...