Mullah Omar's death poses an existential crisis for the Afghan Taliban, analysts say, potentially presaging a splintering of the movement as the Islamic State group gains a toehold among insurgents enthralled by its battlefield prowess.

The group has suffered a string of recent defections to IS, with some insurgents voicing disaffection with the "ghost leader", who hasn't been seen in public since the 2001 U.S.-led invasion toppled the Afghan Taliban from power.

Turkey's allies know it is playing a double game with its twin onslaught against Kurdish rebels and the Islamic State group, but are turning a blind eye to keep NATO's only Muslim member on side, analysts said.

The very public show of solidarity for Turkey's fight against "terrorism" at an emergency NATO meeting on Tuesday hid the discomfort some allies feel about President Recep Tayyip Erdogan's strategy.

Taliban chief Mullah Omar has cast a long shadow over Afghanistan ever since he led a young band of zealots to power almost two decades ago, imposing brutal Islamist rule over the country.

The current Kabul government is investigating reports of his death, a presidential spokesman said Wednesday, amid frenzied speculation about the rumored demise of the reclusive warrior-cleric.

Thousands of migrants are trying to cross the Channel from France in search of a better life in Britain -- but what makes them risk their lives traveling from one wealthy European country to another?

The answer is partly down to the allure of living in a country where many of them speak the language, English, and where they might have family or cultural connections, experts say.

Critics of the Iran nuclear deal claim it is flawed, among many reasons, because it does not demand that Tehran also change its behavior at home and abroad. That complaint ignores the United States' long history of striking arms control agreements with the Soviet Union, a far more dangerous enemy.

Those deals probably made the world a safer place through some of the darkest days of the Cold War, and they proved talks could be productive even with a sworn adversary.

A landmark deal on Iran's nuclear program has breathed new life into plans for a gas pipeline through Pakistan -- and sparked a geopolitical tussle, with Russia looking to expand its influence, observers say.

With sanctions on Iran likely to ease and peace talks between the Taliban and Afghan government getting under way, wrangling is intensifying over the proposed pipelines, which would link Central Asia to the Middle East.

A deadly suicide bombing in southern Turkey appears to be part of the Islamic State group's war against the Kurds, and shows the country's growing vulnerability to the conflict in neighboring Syria, analysts say.

The attack on Monday on a gathering of pro-Kurdish activists in Suruc along the Turkish-Syrian border, which killed at least 32 people, bore the hallmarks of the Sunni extremist organization.

The return of oil from Iran following the landmark nuclear energy deal with world powers could create fresh tensions within OPEC but may reinforce the cartel's output strategy, analysts say.

Tehran and major powers -- Britain, China, France, Germany, Russia and the United States -- clinched a historic agreement in Vienna on Tuesday aimed at ensuring Iran does not obtain a nuclear bomb, and which paves the way for the removal of sanctions and the gradual return of Iranian oil to the global market next year.

The landmark deal on Iran's nuclear program that Russia helped steer through marathon talks is a diplomatic fillip for Moscow which will boost trade with Tehran but could also hit much-needed energy revenues, analysts said.

Iran and the P5+1 group -- Russia, the United States, China, Britain, France and Germany -- struck an agreement on Tuesday that would progressively lift economic sanctions against Tehran in exchange for limitations on its nuclear program.

A close alliance between the U.S.-led coalition battling the Islamic State jihadist group and Syrian Kurdish fighters has racked up successes, but also stirred resentments that could hamper the campaign.

Analysts warn that IS can only be defeated in Syria with support from Sunni Arabs, many of whom are being alienated by what they see as U.S. favoritism towards the Kurdish minority.