Although the unrest in Hong Kong has become an embarrassment for China’s ruling Communist Party, experts said it was unlikely that President Xi Jinping would take drastic action, such as deploying troops.

Takeaways: Here are four things to know about the recent protests and why they took a destructive turn this week.

See for yourself: One of our video journalists was on the streets with the protesters on Monday. We also have a map showing where demonstrations have taken place in the past month.

Ships vanish to evade sanctions on Iran

It isn’t illegal under international law to buy and haul Iranian oil or related products, but under the sanctions imposed by the Trump administration in November, foreign companies that do that and then conduct business with American companies risk punishment by the U.S.

Some shipping fleets have defied the restrictions by “going dark” when they pick up cargo in Iranian ports, according to commercial analysts and intelligence from the authorities in Israel.