The latest developments from the annual U.N. gathering of world leaders at which they're tackling major crises like the refugee issue and crises in Syria, Yemen and elsewhere:

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10 a.m.

The U.N. secretary-general has scolded South Sudan's president as the world watches whether the latest shaky peace deal in his country will hold, saying, "I hope you will not betray and disappoint us."

Ban Ki-moon spoke at a high-level meeting on the conflict in the world's youngest country during a U.N. gathering of world leaders.

South Sudan President Salva Kiir, who annoyed the international community by skipping a similar U.N. meeting last year, spoke Tuesday via videoconference from his country.

Kiir said "we have already made considerable progress in implementing the agreement" that he signed with several reservations late last month.

Kiir signed under heavy pressure from the United States, which had championed the country's fight for independence from Sudan.

Kiir accused the opposition of continuing to violate a cease-fire.