South Korea said North Korea has installed its own border loudspeakers in response ... The tit-for-tat over speakers and balloons — both Cold War-style psychological warfare — have deepened ...

That the provocations exchanged between the Koreas – leaflets, balloons, and noise – were of relatively low intensity should give no one a sense of security.

Every day since July last year, loudspeakers on the other side of the inter-Korean border have been blaring haunting noises or loud crackly ones, like a gong being beaten or metal grinding.