The North Korean mission to the United Nations did not respond to a request for comment on the report, which was submitted to the security council committee last week.
The arrival of new, US-made F-35A stealth fighters in South Korea, the visit of an American nuclear-powered submarine to a South Korean port, and United States tests of ballistic missiles, are among the steps that have forced North Korea to continue its own weapons development, the spokesman said.
President Trump somewhat downplayed the threat from the North over the missile tests, while experts say the tests are created to pressure Washington to resume diplomacy.
The U.S. and South Korea say the drills are defensive in nature, while North Korea sees them as preparation to invade.
"They remain unchanged in their position to continue to face us as an enemy", a North Korean government spokesman said on KCNA.
"It is too axiomatic that a constructive dialogue can not be expected at a time when a simulated war practice targeted at the dialogue partner is being conducted", said the statement released by Pyongyang's official Korean Central News Agency.
Pyongyang "will be compelled to seek a new road as we have already indicated" if South Korea and the United States continue with hostile military moves, he added.
"It is too axiomatic that a constructive dialogue can not be expected at a time when a simulated war practice targeted at the dialogue partner is being conducted".
Flying car hovers during Japanese demonstration
For your information, Japan's startup company Cartivator's flying auto crashed during the same test in 2017. NEC Corp. showed a large drone-like machine with four propellers that hovered steadily for about a minute.
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The group says if something isn't done, they will work to vote lawmakers out of office this next election cycle. The Republican president called the El Paso shooting a "hateful act" and "an act of cowardice".
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The blasts injured 12 people with one missing and led to a mass evacuation of 16,000 residents from the nearby city of Achinsk. A source from another agency, RIA, at the defense ministry denied the information about the soldier's death.
The Pentagon said Tuesday that the US will not act haphazardly in response to North Korea's spate of missile launches over the past two weeks, stressing that diplomatic channels must remain open.
US and South Korean intelligence officials say the missiles appear to be similar to the short-range ballistic missiles launched by North Korea on July 25, the statement said.
South Korea's defence ministry said the launches went against the spirit of easing tension on the Korean peninsula.
The arrival of new, US-made F-35A stealth fighters in South Korea and USA balliastic missile tests are among the steps that have forced North Korea to continue its own weapons development, the spokesman said.
South Korea's Defense Ministry on Monday didn't initially confirm the start of the joint military exercises before Defense Minister Jeong Kyeong-doo told a parliamentary hearing that the drills had begun.
Prior to the latest launches, US President Donald Trump, who has been hoping to revive the stalled talks on denuclearisation with Kim Jong-un, has played previous tests. But the North insists even the downsized drills violate agreements between the leaders.
The North's recent tests have dampened the optimism that followed the third summit between Mr Trump and Mr Kim on 30 June at the inter-Korean border.