港股南方兩倍做多三星電子(07747)跌超20%，南方兩倍做多海力士(07709)跌超18%。

The US Department of Homeland Security on the 16th announced a rule limiting stays for foreign students and exchange visitors to a maximum of four years; extensions must be applied for through US Citizenship and Immigration Services (USCIS). Stays for foreign media representatives are also being shortened. DHS said the final rule will be published in the Federal Register within days and will take effect 60 days after publication.

Kremlin says it is in contact with Iran but has not received a request for a call with Russian President Putin.