The United Nations chief warned Israel on Tuesday that Prime Minister Benjamin Netanyahu ’s rejection of a two-state solution will indefinitely prolong a conflict that is threatening global peace and emboldening extremists everywhere.

In his toughest language yet on the Israeli-Hamas war, Secretary-General Antonio Guterres told a ministerial meeting of the U.N. Security Council that “the right of the Palestinian people to build their own fully independent state must be recognized by all, and a refusal to accept the two-state solution by any party must be firmly rejected.”