Neither will NK, they even advised us to get out. The US doesnt need to attack us, they already their military here. Number of NK military bases out NK = 0 Number of Yank bases outside US, too many to count, see for yourself http://www.globemaster.de/regbases.html
An impartial look at the Korean war by the BBC, the title is theirs not mine: "Kill 'em All': The American Military in Korea" http://www.bbc.co.uk/history/worldwars/coldwar/korea_usa_01.shtml
It doesnt surprise me, they are still torturing people to this day who havent been convicted or even charged. They are raping 8 yo boys on front of their parents in Iraq to try and get info out of them. Think about how youd feel in an invading force did that to your kids. I wont link pages in case there are disturbing photos on it but you can see from the search results that its a fact. https://duckduckgo.com/?q=Us military raping boys
It does seem like posturing to me. Even the Russians who always love to veto any UN resolution regarding interfering in foreign policy ( ie Syria ) have actually now piped up to tell North Korea to calm down.