Andrew Parker, the director general of MI5, called upon the European Union to work with the United Kingdom in their collective fight against militant and Russian forces.
Recall that during the meeting, Andrew Parker also turned to the topic of the Middle East.
Last October, Mr Parker warned the United Kingdom was facing the highest tempo of threats he had seen during more than three decades working at MI5 following a spate of Islamist-inspired terror attacks on United Kingdom soil.
Andrew Parker, the head of United Kingdom spy agency the MI5, has warned of the threats facing Europe from Islamic State and Russian Federation.
Mr Parker, who has a 35-year career in intelligence, will say: "In today's uncertain world we need that shared strength more than ever".
The UK suffered four deadly militant attacks past year that killed 36 people, the deadliest spate since the London "7/7" bombings of July 2005.
Police officers lay flowers in honor of the victims of the March 22 terror attack on the Westminster Bridge by the Houses of Parliament in central London on March 23, 2017.
Monday's updated total brings the number of disrupted attacks in the United Kingdom to 25 since 2013.
He will describe the Counter Terrorism Group as the "largest multinational counter-terrorism enterprise in the world" where "real-time intelligence sharing" involves "thousands of exchanges on advanced secure networks every week".
But Mr Parker will reserve his toughest language for Russian Federation, saying Mr Putin's government is pursuing an agenda through aggressive and pernicious actions by its military and intelligence services.
Britain blames Russia for the poisoning of Sergei Skripal, a former colonel in Russian military intelligence who betrayed dozens of agents to Britain's MI6 foreign spy service, and his daughter Yulia who were both found unconscious on a bench in the cathedral city of Salisbury on March 4.
The UK has nevertheless said it has intelligence which shows the attack on March 4, which involved a nerve agent from the novichok family of substances, was carried out by Russian Federation.
Mr Parker accused the Russian State of carrying out a nerve agent attack in Salisbury, supporting the Syrian government despite its use of chemical weapons on civilians, invading Crimea, seeking to interfere in elections in the U.S. and France, attempting to mount a coup in Montenegro and carrying out cyber attacks on Western institutions.
Parker will accuse Russian President Vladimir Putin's government of being "in flagrant breach of worldwide rules" and say it's guilty of pursuing "aggressive and pernicious actions by its military and intelligence services".