Kim Jung Un took power in 2011 from his father, during obamas presidency. An increase in tests right after taking power is logical as a show of power for a new leader. Im not convinced that these tests have lessened under trump, i havent been able to find nu bers either way.. during rhe last year there was a while it felt like they were every week and this is the first time they had a weapon capable of reaching us, so whatever the numbers are i dont think we can say trump coming to power has improved things at all.
There are reasons other presidents have declined the opportunity to sit down with north korea - including other republican presidents. And republicans in the past have been against even the idea of it.. but whatever.
As far as im concerned, fine give it a shot but i doubt it will accomplish anything other than optics, and i do find it a bit hypocrotical.
His administration btw is walking back these statements saying trump will only meet if preconditions are met, the same reason obama didnt end up meeting with them(the preconditions werent met) . So i guess well just wait and see.