The head of MI5 chief will today warn of the "intense and unrelenting worldwide terrorist threat" in Europe, with the security service thwarting attacks on Britain at a rate of one every month since the Westminster attack in March 2017.
Speaking at a meeting of European security heads in Berlin, Germany, MI5 head Andrew Parker insisted that despite the UK's withdrawal from the EU, intelligence co-operation between the two powers could continue to be necessary to tackle growing terror threats.
Against the backdrop of Brexit negotiations, the chief stressed that European intelligence agencies must rely on "shared cooperation more than ever".
"The reckless attempted assassination of Sergei Skripal, using a highly lethal nerve agent, put numerous lives at risk, including that of his daughter", Parker said Monday, accusing the Kremlin of "flagrant breaches of worldwide rules".
The UK said the Skripals were attacked with a military-grade nerve agent from the Novichok group of poisons, developed by the Soviet Union in the 1970s and 80s.
He also criticised Russia's actions after the incident in Wiltshire.
"European intelligence cooperation today is simply unrecognisable to what it looked like five years ago", he said, highlighting that there have been as many as 45 terror attacks across Europe since 2016.
Former Russian military intelligence colonel Sergei Skripal attends a hearing at the Moscow District Military Court in Moscow on August 9, 2006.
"We look forward to that day but our respect for Russia's people and desire for a productive relationship can not and must not stop us from calling out and pushing back on the Kremlin's flagrant breaches of worldwide rules", he said.
He will note that 28 European countries agreed to support the United Kingdom in expelling scores of Russian diplomats.
Russian Federation denied any involvement in the Salisbury attack and challenged Britain to prove Moscow was to blame.
Mr Parker appealed for Brexit not to derail security collaboration in Europe as he revealed that the...
The need "to shine a light through the fog of lies, half-truths and obfuscation that pours out of their propaganda machine" will be set out in his remarks, the first ever made outside Britain by a serving head of MI5.