It was not just prior.
The upgrades began after the summit.
And it is not just "a couple of new relatively small buildings":
Infrastructure improvements at the Yongbyon nuclear plant, which is used to fuel the country’s weapons program, are “continuing at a rapid pace,” according to analysis by monitoring group 38 North. The upgrades include the modification of a cooling system for the plutonium production reactor, at least two new non-industrial buildings, and a new engineering office building.
Who "told" Trump to do this?
Because it is well known and established that Trump has acted on his own, without any advice or instructions from Congress, who were taken by surprise at the concessions Trump made to Kim Jong Un and getting nothing but a photo op in return.
Ya, China would be all hunky dory with the US attacking a neighbour on its border...
There is no actual deal. Just vague and empty comments.
So what has North Korea actually reneged on? Can you please be specific?
No!
Really?!? [Insert my shocked face here..]
He didn't get played. Trump was going for a Nobel Peace Prize and he's given away, including the kitchen sink for a vague statement with no actual "deal". But hey, at least he got some cool photos and got to show someone his limo...
North Korea has been launching missiles for a while now, over Japan, towards China and Russia before bringing them down before they went over the border to China and Russia.
What do you think happened?