Defence experts have met in parliament to discuss the threats from hybrid warfare and how to best meet them.
Hybrid threats include military and non-military attacks such as cyber warfare and propaganda.
Notably, nerve agent incidents in Salisbury are among hybrid threats countries like the UK are currently exposed to.
In March 2018, two Russian nationals were attacked with a deadly nerve agent in Salisbury.
While Sergei and Yulia Skripal survived exposure to Novichok, a British national died as a result of exposure to the same substance.
Dawn Sturgess died after coming into contact with a perfume bottle that had originally contained the substance used to poison the Skripals.
"One thing that the current Russian leadership seems to want to do is intimidate Western countries, govenment and audiences," said Duncan Allen, Associate Fellow of the Russia and Eurasia Programme at Chatham House.
The committee was asked to consider the impact of the government’s austerity policy on national security.
In Salisbury, the armed forces and private security guards had to be brought in.
Theresa May has demanded those behind the Salisbury attack be brought to justice, while Russia continues to deny any involvement.
Meeting Russian president Vladimir Putin last month, Mrs May told him the use of the Novichok nerve agent in the Wiltshire city was a "truly despicable act".