A Look At North Korea's Nuclear Threat (In 3 Charts)

North Korean leader Kim Jong Un inspects the intermediate-range ballistic missile Pukguksong-2's launch test in this undated photo released by North Korea's Korean Central News Agency, May 22, 2017. KCNA | Reuters

CNBC: North Korea's growing nuclear threat – in 3 charts

* Since 2011, Kim Jong Un has fired more than 90 missiles and conducted four nuclear weapons tests.
* North Korea remains the only nation to test nuclear weapons in this century.

While the details of the unprecedented summit between President Donald Trump and Kim Jong Un begin to take shape, experts are reminding everyone that North Korea spent most of 2017 perfecting its missile arsenal.

One expert even voiced his skepticism by comparing the relationship between the U.S. and North Korea to a recurring scene of frustration in "Peanuts" cartoons.

"Historically, every time Charlie Brown runs for the football, Lucy pulls it away," Thomas Karako, director of the Missile Defense Project at the Center for Strategic and International Studies, told CNBC. "It would be a remarkable thing if Lucy didn't pull the football out from Charlie Brown this time, but it's one of those things where I'll believe it when I see it."

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WNU Editor: The trend lines are clear .... North Korea has been making steady progress for years.