Pukguksong-2 north korea missileA view of the test-fire of Pukguksong-2 guided by North Korean leader Kim Jong Un on the spot in a photo released by North Korea’s Korean Central News Agency on February 13.KCNA/Handout via Reuters

Secretary of State Rex Tillerson made it official on Friday: The US is considering a preemptive military strike on North Korea. Recent missile tests show that North Korea really is practicing a so-called saturation attack that would seek to fire ballistic missiles with such volume that they defeat missile defenses and slaughter US and allied forces in Japan and South Korea.

US President Donald Trump has apparently identified North Korea as his most serious external challenge, and he has reportedly declared the country the single greatest threat to the US. On Friday, Trump tweeted: “North Korea is behaving very badly. They have been ‘playing’ the United States for years.” He also blamed China, the North’s biggest ally, for not doing more to help.

In reality, taking out North Korea’s nuclear capabilities, or toppling the Kim regime, would pose serious risks to even the US military’s best platforms.

Business Insider spoke with Stratfor‘s Sim Tack, a senior analyst who isĀ an expert on North Korea, to determine exactly how the US could carry out a crippling strike against the Hermit Kingdom.