The Quad grouping was heavily promoted by former Japanese prime minister Shinzo Abe as a bid by the region's major democracies to step up cooperation in the face of an increasingly assertive China.
Before Pompeo landed in Greece, he had a conversation on tensions in the eastern Mediterranean with NATO Secretary-General Jens Stoltenberg.
Poland's President Andrzej Duda said the troop deployment deal would also further other aspects of US-Polish cooperation primarily on investment and trade ties.
Iran's supreme leader has responded by ruling out negotiations with the US over Tehran's ballistic missile and nuclear programmes and urging Iranians to resist pressure.
A Turkish court heard a case aimed at converting the Hagia Sophia back into a mosque. It will announce its verdict within 15 days.
Turkey rejects both the style and content of US Secretary of State Mike Pompeo's statements regarding our country with respect to Syria, said Turkey’s Foreign Ministry.
Turkish officials say they have evidence that indicates Riyadh critic and journalist Jamal Khashoggi was killed and dismembered at the Saudi consular building in Istanbul he visited on October 2 to get documents for his planned marriage.
US Secretary of State Pompeo promised support for President Ghani's bid to start peace talks with the Taliban but Taliban rejects negotiations with Kabul, demanding direct talks with Washington.
Rex Tillerson will retain the title of secretary of State until March 31, just over a year since he began the job. US President Donald Trump fired him following a series of rifts over foreign policy matters.
The visit is Tillerson's second stop on a shuttle diplomacy tour aimed at resolving the ongoing diplomatic crisis in the Gulf region.
Secretary of State Rex Tillerson made the remark on a visit to South Korea, adding that the US was looking at all options to deal with the nuclear-armed state.
US Secretary of State John Kerry warns Syria's Assad of ‘repercussions' if truce and transition fail.
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