The pair greet each other cordially, after clashing on issues from migration to climate change.
The warning comes after soldiers clashed with militants in the southern Philippines.
The decision paves the way for Taiwan to become the first place in Asia to allow same-sex marriages.
Why Venezuelan parents are keeping their children at home
What are the rules for meeting the Pope?
How Zambia's motorcade row led to treason charges
Why a $1.6bn car plant has been abandoned
How Trump sees the continent as he arrives in Italy
Is this angry young lawyer India's new Dalit icon?