'America does not seek conflict or confrontation, but we will never run from it'

Echoing remarks he made alongside South Korean President Moon Jae-in Tuesday, Trump warned North Korea "do not try us."

"History is filled with discarded regimes that have foolishly tested America's resolve," he said. "Anyone who doubts the strength or determination of the United States should look to our past and you will doubt it no longer. We will not permit America or our allies to be blackmailed or attacked."

"If you want peace," Trump told South Korean lawmakers, "you must stand strong at all times. The world cannot tolerate the menace of a rogue regime that threatens with nuclear devastation."

'The weapons you are acquiring are not making you safer. They are putting your regime in grave danger'

At several points in his speech, Trump addressed the North Korean leader Kim Jong Un directly.

"I have also come here, to this peninsula, to deliver a message directly to the leader of the North Korean dictatorship," Trump said. "Every step you take down this dark path increases the peril you face."

"North Korea is not the paradise your grandfather envisioned," he added. "It is a hell that no person deserves."

Later, Trump described North Korea as a "country ruled by a cult."

CNN correspondent Will Ripley, who is currently in Pyongyang, said this type of language is likely to be "more infuriating to the North Koreans than the fiery rhetoric (Trump has) used before" as the US leader "directly criticized their ideology and authoritarian system."

Though Trump had previously indicated he would consider future negotiations with Kim, a point Moon was keen to emphasize Tuesday, his speech was less conciliatory.

'Why would China feel an obligation to help North Korea?'

As the North Korean issue has consumed the first year of his presidency, Trump has been adamant that Beijing must do more to rein in its longtime ally.

Echoing comments made earlier this week, Trump called on "every nation, including China and Russia, to fully implement UN Security Council resolutions, downgrade diplomatic relations with the regime, and sever all ties of trade and technology."

He heads to the Chinese capital later Wednesday, and, amid a litany of alleged North Korean human rights abuses, he gave an example of why Beijing should be wary of its neighbor.

"North Korean women are forced to abort babies that are considered ethnically inferior. And if these babies are born, the newborns are murdered," Trump said. "One woman's baby born to a Chinese father was taken away in a bucket. The guard said it did not deserve to live because it was impure."

Appealing to China's morality is a different tack for Trump, and may be a preview of how he plans to approach the North Korea issue with President Xi Jinping.

'Korean golfers are some of the best on Earth'

One of the largest applause lines in Trump's speech was nothing to do with politics, but came when he poured praise on South Korea's golfing prowess.

"The women's US Open was held this year at Trump National Golf Club in Bedminster, New Jersey, and it just happened to be won by a great Korean golfer, Sung Hyun Park, and eight of the top 10 players were from Korea," Trump said.

"And the top four golfers -- one, two, three, four -- the top four were from Korea. Congratulations."