SEOUL, South Korea (AP) - After years of effort to develop nuclear missiles that can target the U.S. mainland, is North Korean leader Kim Jong Un really ready to pack them away in a deal with President Donald Trump?

Perhaps, but that wouldn’t necessarily mean Pyongyang is abandoning its nuclear ambitions entirely.

Tuesday’s meeting in Singapore between Kim and Trump comes after a sharp turn in North Korea’s diplomacy, from rebuffing proposals for dialogue last year to embracing and even initiating them this year. The change may reflect a new thinking about its nuclear deterrence strategy - and how best to secure the ultimate goal of protecting Kim’s rule.

A look at how Kim’s appetite for talks swung amid the North’s ups and downs in weapons development and what that says about how he might approach his negotiations with Trump:

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TESTS AND TALKS

North Korea’s attitude toward dialogue in the past two years has seemed to shift with setbacks or progress in its weapons tests.

Even after starting a rapid process of weapons development following a nuclear test in January 2016, Pyongyang constantly invited rivals to talks that year.

It proposed military meetings with Seoul to reduce tensions and indicated it could suspend its nuclear and missile tests if the U.S.-South Korean military drills were dialed back. Washington and Seoul demurred, saying Pyongyang first must show genuine intent to denuclearize....

At the time, North Korea’s quest for a credible nuclear deterrent against the U.S. was troubled. The military conducted eight tests of its “Musudan” intermediate-range missile in 2016, but only one of those launches was seen as successful. The country’s path toward an intercontinental-range ballistic missile appeared cut off.North Korea’s stance on dialogue changed dramatically, though, following the successful test of a new rocket engine in March 2017, which the country hailed as a significant breakthrough.The engine, believed to be a variant of the Russian-designed RD-250, powered a successful May flight of a new intermediate-range missile, the Hwasong-12, reopening the path to an ICBM. That was followed in July by two successful tests of an ICBM, the Hwasong-14.Pyongyang’s demands for talks disappeared. Proposals to meet from a new liberal government in Seoul were ignored. Determined to test its weapons in operational conditions, the North flew two Hwasong-12s over Japan and threatened to fire them toward Guam, a U.S. military hub.The North’s state media brought up President Richard Nixon’s outreach to Beijing in the 1970s following a Chinese test of a thermonuclear bomb, saying it was likewise inevitable that Washington will accept North Korea as a nuclear power and take steps to normalize ties.Kim talked of reaching a military “equilibrium” with the U.S. By all signs, he was fully committed to completing an ICBM program he intended to keep.___THE DETERRENCE GAMEKim’s turn toward diplomacy this year suggests he may have concluded the nuclear deterrence strategy was failing, some analysts say.After a November test of a larger ICBM, the Hwasong-15,

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