A meeting chaired by Kim Jong-un also discussed increasing the capabilities for deterring “the threatening foreign forces," according to state media KCNA.
South Korea responded to shots fired from across the DMZ but no casualties were reported.
North Korean leader Kim Jong-un made his first public appearance in 20 days as he celebrated the completion of a fertilizer factory near Pyongyang, state media said, ending an absence that triggered global rumors that he was seriously ill.
It is believed that Kim Jong Un has been found in the eastern city of Wonsan amid speculation that his health is failing.
The string of weapons drills come as a prolonged hiatus in disarmament talks with the United States drags on, and despite recent overtures from Washington offering help to contain the pandemic.
North Korean leader Kim Jong-un's half brother Kim Jong-nam was a spy for American intelligence, the Wall Street Journal reported, saying he was in Malaysia to meet his CIA handler in February 2017.
Kim and his wife were among the elite at the premiere of the games on Monday in Pyongyang, but North Korea's leader was unhappy with the event's organisers, state media said.
He said the truth is that North Korea's leader is telling his people that they have to limit rations to 300 grams per day — the equivalent of five slices of white bread — "at the same time he's begging for food from the (UN) World Food Program."
Can Russian President Vladimir Putin pick up where the US has failed in the Korean Peninsula?
How a crowd of 40,000 North Korean spectators put on a synchronised show, making marathon runners feel like professional athletes attending the opening ceremony of the Olympic Games.
North Korea is saying that it had test-fired a new type of "tactical guided weapon," its first such test in nearly half a year. The country is also demanding the removal of US Secretary of State Mike Pompeo from talks over its nuclear programme.
Emulating his late father and grandfather, who took epic train trips when they were leaders, Kim set off on the long journey from Pyongyang, with a military honour guard seeing him off in the North Korean capital.
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