António Guterres was speaking to journalists on Thursday (28 April) at the Presidential Palace.

Guterres said he had witnessed the pain "very vividly", including "the senseless loss of life, the massive destruction, the unacceptable violations of human rights and the laws of war."

According to the UN chief, "it is vital that the International Criminal Court and other UN mechanisms conduct their work so that there can be real accountability."

Guterres said "the Security Council failed to do everything in its power to prevent and end this war" and this is "a source of great disappointment, frustration and anger."