Sinn Féin leader Gerry Adams has recalled talking global politics with Fidel Castro.
Mr Adams, 68, said Castro told him when they met in 2001 that he saw climate change and neo-liberalism as the greatest threats to humanity.
He said they also discussed the September 11, 2001, terror attack on New York and Washington and Castro told him that "progressive struggles would never again be won by armed actions" but by "ideas and mobilisations".
Mr Adams is in Havana after attending attending Tuesday's night memorial service for Castro, 90, who died.
He said the mood at the service "was almost like a family who had lost a very elderly relative" and regretted more western European leaders did not attend, other than Greek prime minister Alexis Tsipras.
Mr Adams also visited a memorial in the Cuban capital to 10 Irish republican inmates, led by IRA prisoner Bobby Sands, who starved themselves to death in the North's main prison in 1981 in a bid to win political-prisoner status.