Pyongyang has broken with much of its inter-Korean policy in recent years and ramped up weapons testing.
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Launches come days after South Korea and US wrapped up military drills Pyongyang sees as an invasion rehearsal.
State media says car ride is ‘clear proof’ of the close and deepening relationship between the two countries.
Kim tells troops to complete ‘war preparations’ during military demonstration as South Korea and US wrap joint drills.