The International Criminal Court has terminated the case against Kenya's deputy president and ended his trial, saying there is insufficient evidence he was involved in deadly violence that erupted after his country's 2007 presidential elections.

Tuesday's announcement marks the second time the court has had to admit defeat in its attempts to prosecute alleged ringleaders of the violence that left more than 1,000 people dead and forced 600,000 from their homes in Kenya.

Deputy President William Ruto had been charged alongside broadcaster Joshua Sang with murder, deportation and persecution for their alleged leading roles in the violence.