Saudi Arabia has publicly accused the United Arab Emirates – a fellow Gulf Arab state and former partner in the Yemen war – of undermining its national security, an unusually blunt charge that exposes a rift long kept behind closed doors.

Saudi Arabia plans to open its financial markets to all foreign investors from February 1, the Gulf country's market regulator said on Tuesday, as it eases rules to attract more money from abroad. The amendments approved by the Capital Markets Authority eliminate the concept of the Qualified Foreign Investor,