In 1989, the longest human chain in history (675 kilometres) was formed from north Estonia across Latvia to south Lithuania, as a moral protest against the illegal occupation of those lands by the Soviet Union. Thirty years later, thousands of protesters formed an unauthorised but peaceful human chain across Hong Kong in a movement against the erosion of liberties under Chinese rule. On 29 August, at 3 am, Hong Kong became alarmed as Chinese troops, armoured personnel carriers and trucks poured into the city in what Beijing called 'routine' troop rotation. China has made it clear recently that it considers a military intervention in the crisis a viable option, despite US warnings that this might lead to a repeat of the 1989 Tiananmen Square massacre. On 30 August, three prominent protesters were arrested. See