By Philip Pullella ABOARD THE PAPAL PLANE (Reuters) - Pope Francis said on Tuesday he believes the Roman Catholic Church's ban on women becoming priests is forever and will never be changed, in some of his most definitive remarks on the issue.

By Joe Bavier ABIDJAN (Reuters) - Voters in Ivory Coast overwhelmingly approved a new constitution in a weekend referendum, according to provisional results announced by the elections commission on Tuesday, though opposition groups denounced the turnout figure as fraudulent.

By Brad Brooks CURITIBA, Brazil (Reuters) - He was already among the most reviled politicians in Brazil and now he is among the most feared. Eduardo Cunha, the former speaker of the lower house of Congress who led the impeachment of a president while at the same time being accused of graft, was arrested two weeks ago on multiple corruption charges.

CALAIS, France (Reuters) - French authorities will on Wednesday begin transferring about 1,500 unaccompanied migrant minors to reception centers across the country, officials said on Tuesday, as a standoff with Britain over who takes care of the youths drags on. The minors have been housed temporarily in converted shipping containers in Calais.

By Diego Oré and Fabian Cambero CARACAS (Reuters) - Venezuela freed four activists and the opposition postponed a symbolic trial in congress of President Nicolas Maduro on Tuesday even as it warned it would quit Vatican-backed talks in a matter of days if tough conditions were not met.

MOSCOW (Reuters) - Russian Defence Minister Sergei Shoigu said on Tuesday a Western failure to rein in violent Islamists in Syria had indefinitely delayed the resumption of peace talks. Shoigu said that rebels backed by Western governments had been attacking civilians in the Syrian city of Aleppo, despite a pause in Russian and Syrian air attacks.

By Babak Dehghanpisheh and Michael Georgy ZARQA/SHURA, Iraq (Reuters) - After Islamic State conquered villages in northern Iraq, it spelled out in minute detail the rules of its self-proclaimed caliphate, from beard length to alms to guidelines for taking women as sex slaves.

By Stephen Kalin and Dominic Evans EAST OF MOSUL, Iraq (Reuters) - Iraqi forces battled Islamic State fighters on the eastern edge of Mosul on Tuesday as the two-week campaign to recapture the jihadists' last main bastion in Iraq entered a new phase of urban warfare.

By Ju-min Park SEOUL (Reuters) - The woman at the center of a political scandal that has cast the South Korean presidency into crisis was detained late on Monday, a prosecution official said, hours after she had arrived at the office of local prosecutors to answer questions.

By Adam Jourdan and Jackie Cai SHANGHAI (Reuters) - At the end of Philippines President Rodrigo Duterte's landmark visit to China last month, he held a brief private meeting with a businessman who may have played a crucial role in improving ties between the two nations.