Reuters World News Summary

Following is a summary of current world news briefs. Russia denying U.S. diplomats access to detained investor: embassy

The United States said on Thursday that Russia had failed to grant its diplomats access to detained U.S. national Michael Calvey a week after the founder of Baring Vostok private equity group was detained in Moscow. The U.S. embassy said in a statement it had asked multiple times to visit Calvey in custody but had not received permission, which it said flouted consular rules between the two countries. Venezuela's Guaido to lead convoy to Colombia border to receive aid

Venezuelan opposition leader Juan Guaido plans to head to the Colombian border in a convoy of vehicles on Thursday to receive humanitarian aid for his crisis-stricken nation, despite the objection of increasingly isolated President Nicolas Maduro. Guaido, recognized by dozens of countries as Venezuela's legitimate head of state, said the opposition plans to bring in aid by land and sea on Saturday to alleviate severe and widespread shortages of food and medicine. No tsunami warning after Japan quake: state broadcaster

An earthquake with a preliminary magnitude of 5.7 hit Japan's northern island of Hokkaido on Thursday, the Japan Meteorological Agency said. The epicenter of the earthquake was in Hokkaido's south-central Iburi region, the agency said. State broadcaster NHK said no tsunami warning had been issued. Nigeria's Buhari, Atiku make final appeal for votes ahead of delayed poll

Nigeria's President Muhammadu Buhari and his closest rival Atiku Abubakar made their final appeal for votes on the last day of campaigning on Thursday ahead of a tight contest in a presidential election on Saturday that was delayed by a week. The Independent National Electoral Commission (INEC) announced the delay in the early hours of last Saturday citing logistical reasons, just as some of Nigeria's 84 million registered voters were preparing to head to the polls. Drone briefly shuts down operations at Dublin airport

Flight operations at Dublin airport were briefly suspended on Thursday due to the confirmed sighting of a drone over the airfield, Ireland's largest airport said, the first time such disruption has been caused at an Irish airport. Dublin airport told passengers on its Twitter page that it had suspended operations at 1149 GMT, before resuming 15 minutes later. Putin to U.S.: I'm ready for another Cuban Missile crisis if you want one

President Vladimir Putin has said that Russia is militarily ready for a Cuban Missile-style crisis if the United States is foolish enough to want one and that his country currently has the edge when it comes to a first nuclear strike. The Cuban Missile Crisis erupted in 1962 when Moscow responded to a U.S. missile deployment in Turkey by sending ballistic missiles to Cuba, sparking a standoff that brought the world to the brink of nuclear war. Where Libya's revolution began, many now yearn for a strong hand

Sitting in his cafe near the spot where the protests against Muammar Gaddafi touched off the Libyan revolution eight years ago, Miftah Atluba is not sorry the dictator has gone. Yet like many in Benghazi, who are tired after three years of street fighting that flattened whole districts, the 45-year-old thinks it's time to return to the old way of running things. Despite Putin's swagger, Russia struggles to modernize its navy

President Vladimir Putin calls improving the Russian navy's combat capabilities a priority. The unfinished husks of three guided-missile frigates that have languished for three years at a Baltic shipyard show that is easier said than done. Pope opens child sex abuse conference, promising 'concrete' remedies

Pope Francis promised that concrete actions against child sexual abuse by priests would result from a conference he opened on Thursday, countering scepticism from some survivors who said the meeting looked like a public relations exercise. Francis convened Catholic leaders from around the world for the four-day meeting to address the scandal that has ravaged the Church's credibility in the United States - where it has paid billions of dollars in settlements - Ireland, Chile, Australia, and elsewhere over the last three decades. Brexit defections reveal frayed fabric of UK politics

Brexit has torn the fabric of Britain's political system, say a group of 11 lawmakers behind a dramatic series of defections that have sent shockwaves through one of the world's oldest and most stable parliaments. But the group needs to incite a much wider rebellion to achieve its goal of triggering a rethink over the country's exit from the European Union and smashing a two-party structure that they say is no longer fit for purpose.