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Wong Maye-E, Ahn Young-joon / AP

North Korea is quickly becoming President Trump's biggest challenge, but it long predates the new administration. Below is a timeline of how the U.S. and its allies have tried to push North Korea away from building a nuclear arsenal.

October 2006: North Korea claimed to have conducted first nuclear test. The United Nations responded with sanctions.

2007-2008: After start-stop attempts at a deal, the UN backed off sanctions on North Korea in exchange for stripping down its nuclear program.

May 2009: North Korea conducted second nuclear test, received new sanctions.

February 2013: North Korea conducted a third nuclear test, and received more sanctions.

2015: Former President Obama stepped up U.S. cyber attacks on North Korea's missile programs.

2016: North Korea held its 4th and 5th nuclear tests, and conducted more than 14 rounds of ballistic-missile tests — almost all of which failed — and fired 30 different rockets, Business Insider counted up.

November 2016: WSJ reported that the Obama administration told the Trump administration that North Korea was the biggest international threat to the U.S.

March 1, 2017: South Korea and the U.S. held a military exercise — "Foal Eagle"— together.

March 6: North Korea fired four ballistic missiles into the sea near Japan.

March 15: The U.S. holds a flight test of a nuclear bomb.

March 22: North Korea had another failed missile launch on its east coast.

Sunday, April 9: The U.S. deployed a Navy strike group to the waters off the Korean Peninsula, which included two guided-missile destroyers, one guided-missile cruiser, and an aircraft carrier.

Tuesday, April 11: Trump tweeted: "North Korea is looking for trouble. If China decides to help, that would be great. If not, we will solve the problem without them! U.S.A."

Wednesday, April 12: Seemingly in response to the U.S. strike group, satellite images suggested North Korea was going to conduct its sixth nuclear test.

Thursday, April 13: The US placed two Tomahawk cruise missiles carriers in the area — one of them 300 miles from the North Korean nuclear site and NBC reported that the U.S. was preparing to launch a preemptive strike on North Korea. Officials then told AP that those reports were false.

Saturday, April 15: In the morning, North Korea held a military parade, showing off their new ballistic missiles. In the evening, North Korea launched a missile test, which failed.

Sunday, April 16: Mike Pence speaks in the demilitarized zone between North and South Korea. "North Korea would do well not to test [Trump's] resolve ... all options are on the table ... the era of strategic patience is over."

Go deeper

Updated 1 hour ago - Politics & Policy

Giuliani associate Lev Parnas convicted of campaign finance crimes

Lev Parnas, a former associate of then-President Donald Trump’s personal lawyer Rudy Giuliani. Photo: Stefani Reynolds/Bloomberg via Getty Images

Florida businessman Lev Parnas was convicted Friday on charges of conspiracy to make foreign contributions to political campaigns, according to multiple outlets.

Why it matters: Prosecutors said Parnas, then an associate of former President Donald Trump's personal lawyer Rudy Giuliani, funneled over $150,000 from a Russian businessman into U.S. campaigns as part of an effort to land licenses in the U.S.'s legal cannabis industry.

Supreme Court agrees to hear challenges to Texas abortion law

Photo: Saul Loeb/AFP via Getty Images

The Supreme Court on Friday agreed to hear two cases challenging Texas' abortion law, which bans the procedure as soon as six weeks into pregnancy, but left the law in place in the meantime.

Why it matters: The court is moving extraordinarily fast on the Texas cases, compressing into just a few days a process that normally takes months. And that schedule means the court will take up Texas' ban a month before it hears another major abortion case — a challenge to Mississippi's own 2018 ban on abortions after 15 weeks.

Officials warn 5 key tech sectors will determine whether China overtakes U.S.

Illustration: Aïda Amer/Axios

U.S. intelligence officials responsible for protecting advanced technologies have narrowed their focus to five key sectors: artificial intelligence, quantum computing, biotechnology, semiconductors and autonomous systems.

Why it matters: China and Russia are employing a variety of legal and illegal methods to undermine and overtake U.S. dominance in these critical industries, officials warned in a new paper. Their success will determine "whether America remains the world’s leading superpower or is eclipsed by strategic competitors."