In Hong Kong at the moment there is a crisis including rubber bullets, tear gas bombs and protests. The police are trying to stop all these protests with force and violence, even shooting a protestor with live bullets a few weeks ago. All this is happening because of China - they broke The Deal which agreed for 'One country, two systems'.
Hong Kong had been ruled over by the UK from the 1800s until 1997. At this point, the UK gave Hong Kong back to China as long as their human rights and systems remained the same for the next 50 years (up until 2047).