The South Korean military is reportedly bolstering its missiles to simultaneously take out all North Korean military installations in case necessary. Seoul's forces are increasing the number of Hyunmoo missiles in its arsenal to combat rising threats from its neighbour.

Speaking about the increasing intimidation from the North and the South's aim to target all of Pyongyang's military bases, a top Seoul official, who did not wish to be identified, told Yonhap news agency: "To accomplish this, the South needs more ballistic missiles at its disposal."

Tensions between the rival Koreas have escalated over constant defiant acts and war of words. With the US and South Korea set to hold joint military drills in the coming weeks – an exercise that is dubbed by the North as a rehearsal for actual war – the Korean peninsula is bound to be heading for more volatile times.

South Korea currently has three types of Hyunmoo missiles namely Hyunmoo 2A, 2B and 3, which have a strike range of 300km, 500km, and 1,000km, respectively. The South Korean official further added that by purchasing more Hyunmoo short-range missiles would enable Seoul "neutralise threats" from the North.

The North is believed to possess at least 1,000 missiles with various strike range, all of which can be launched at once. The two Koreas are still technically at war as the 1950-53 Korean War did not end in a peace treaty, but only in an armistice.

Pyongyang has also been menacingly accelerating its threats in recent weeks. On Saturday, it warned to unleash "merciless" retaliation against American forces after the US's decision to deploy nuclear-capable B-2 bombers in Guam.

The move has greatly infuriated the North which warned: "The US attempt to invade the DPRK (Democratic People's Republic of Korea) is getting ever-more reckless. The US ever-more undisguised reinforcement of the nuclear force goes to clearly prove that it is trying to make a preemptive nuclear strike at the DPRK."