I'm very concerned about the situation in North Korea. Drumpf has developed a taste for firing missiles; something that I'm sure surprises no-one. Whether these are rational and balanced decisions remains to be seen - I suspect that they are not. They are certainly unilateral decisions which always concerns me.
The tests by North Korea (the exact nature of them is unclear as per the very nature of the DPRK's propaganda machine) are obviously concerning in and of themselves. If the horror clown decides to flex his muscles and fire something at Pyongyang or any missile installation in the DPRK, this would likely cause significant diplomatic issues with Russia and China. The relationships are not as strong, granted, but I think that both countries would be concerned about an attack on NK by the US. Nuclear war is not outwith the realms of possibility - still unlikely, granted, but probably closer now than at any time in recent memory.
I would hope for a diplomatic solution - working with China and Russia (and frankly anyone else) to put sanctions on the Hermit Kingdom. I doubt Drumpf has the diplomatic skills to achieve... anything through this route.