Last week, Defence Secretary Grant Shapps warned the world could be engulfed by wars involving China, Russia, North Korea and Iran in the next five years, and said we are moving "from a post-war to pre-war world".
The head of the British Army said UK citizens should be "trained and equipped" to fight in a potential war with Russia, describing those living today as the "pre-war generation".
General Sir Patrick Sanders' comments prompted anxiety about conscription - something Britain's former top NATO commander General Sir Richard Sherriff said it was time to consider.
Sir Patrick added that the war in Ukraine was a "pressure point" and added that "we cannot afford to make the same mistake" as our predecessors who "stumbled into... ghastly wars", such as the First World War in 1914.
Meanwhile in the Middle East, UK and US forces have launched airstrikes on Yemen in response to the Iranian-backed Houthis' attacks on commercial shipping in the Red Sea.
Sky News spoke to experts about whether World War Three is a possibility - and if we really are living in a "pre-war world".
Here's what they had to say...
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