President Donald Trump said on Monday the United States is ready to build up its nuclear arsenal after announcing it is abandoning a Cold War-era nuclear treaty, as Russia warned the withdrawal could cripple global security.

A new treatment for a drug-resistant strain of tuberculosis can cure more than 90 percent of sufferers, according to a trial hailed Monday as a "game changer" in the fight against the global killer.

Thirty-five Nobel and top mathematics prize winners have warned British Prime Minister Theresa May and European Commission chief Jean-Claude Juncker that scientific research will suffer a serious setback without a good Brexit deal.

Paul Biya, who has ruled Cameroon since 1982, won a landslide victory on Monday in a controversial presidential election as the government tightened security and gunfire erupted in the country's volatile English-speaking regions.

Only weeks ago, the world’s leading climate scientists warned that global warming by 2˚C would have even worse impacts than previously anticipated. The report of the Intergovernmental Panel on Climate Change called for more rapid decarbonization of the global economy to limit warming to 1.5˚.

Poland's governing nationalists came out on top in regional elections on Sunday, but were losing to opposition centrists in mayoral races in large cities including the capital Warsaw, exit polls showed.

A Peruvian court postponed Sunday a ruling on a prosecutor's demand to put opposition leader Keiko Fujimori in preventive detention for 36 months, which she called a conspiracy to "bury" her presidential hopes.

Australian Prime Minister Scott Morrison issued a national apology to victims of child sex abuse in an emotional address to parliament on Monday, acknowledging the state failed to stop "evil dark crimes" committed over decades.

Thousands of Honduran migrants whose trek toward the United States has triggered tirades from US President Donald Trump, forged on Sunday after crossing a river into Mexico, marching for hours.