Sudanese war planes crossed a disputed border region to conduct airstrikes in South Sudan on Monday, a witness said, escalating fighting that threatens to return the neighboring African countries to full-scale war.

The Myanmar opposition leader Aung San Suu Kyi and other members of her party are delaying their parliamentary debut Monday as they seek to resolve a problem concerning the wording of the oath that lawmakers have to take.

Britain’s Prince Harry is to travel to the United States to be presented with a prestigious award honoring his work with war veterans and serving members of the armed forces.

Intense explosions rocked the devastated city of Homs early Monday, opposition activists said, just days after the U.N. Security Council voted to send as many as 300 observers to monitor a tenuous cease-fire in Syria.