The UK is facing a significant increase in security threats, according to the head of MI5, who has warned that Russia is on a 'sustained mission' to cause 'mayhem' on British streets. This alarming message comes amidst reports of a resurgence in terrorist threats from groups such as ISIS and al-Qaeda, which are once again targeting Europe. MI5 has noted a 'staggering' rise in assassination plots and other terror threats, closely linked to activities from Russia and Iran. In response to these escalating dangers, MI5 has foiled numerous terror attacks in recent times, while also raising concerns about potential plots involving UK criminals being used by foreign powers. The situation is further complicated by ongoing tensions in the Middle East, which could lead to increased threats against British citizens.