Build a base of opposition, arm them, train them

What government is in charge of the Cuban island?

Communist party of Cuba

As guaranteed by the US in the treaty made

no, they've been trying to change that forever

Where was their word broken? Espionage? The same way they Cubans have infiltrated the US and sold hundreds of state secrets on the black market?

They've been moving into a position to change the government, it sorta indicates that they don't give a shit about it

If you’re going to use espionage as an example of breaking the deal, then Cuba is just as guilty

yeah because you're dealing with the US lol

And?

Additionally, the cases of Russia (rigging their elections and then when they don't play ball with you cry foul), Iran (obey us or else), etc

and the US aren't trustworthy so you'd want to take defensive positions

You’re acting as if these nations have done absolutely nothing

There's a population of Cubans in Miami that might be turned against you and their's inroads domestically that they might have

True, but that's not my point

What is your point

The point is that the US's word is worthless

Are you sure that doesn’t change nation by nation? President by President? Action by action?

Every action has a reaction

One good action has one in return, a bad one has a bad reaction

Nation by nation, sure, but it's also to do with each country's position on the "game board" as it were

The US has everything to gain and nothing to lose by Korean denuclearization and the reverse for the DPRK

The US could do practically anything and the west will back them and the east will be forced to deal with them

because trying to take them on is a difficult task and doing difficult things is hard

Funding Jihadi rebels in Syria? nah that's fine

Sex abuse in detention facilities? Literally spying on EU citizens?

Black sites in Poland?

Russia is more trustworthy in this regard

because they have a more limited economy and diplomatic arsenal

They can't afford to piss off their friends and make new enemies

Their military isn't capable of occupying the world

You don’t think the US sees a denuclearized as something that is of interest to the US and its allies?

If you’re going to use military strength as a measure of trustworthiness then why does NK trust Russia more then China? For the same reason you just laid out. There are a number of reasons they don’t trust Russia more than China. There is a lot more to consider when it comes to how nations respond and interact with each other on a global level. Yes, brute power has some say in it but it isn’t the only thing that dictates it.

Why would the US lie and trigger North Korea?

To have them decimate Seoul?

Ruin the economy of Japan and SK?

Well yeah, it's the nuclearization that's in the way of their conquest of the DPRK. They have a lot to gain by comprimising their security, lol

I mean why does it compromise their security?

Because they have an outdated military and nuclear weapons are an effective deterrent

With China defending them

That's fickle

They didn't defend them at the UN