On the Trump presidency

Some articles (like this one in The Independent and this one in The Washington Post) mention two possibilities:

1. That Trump might not be as hot-headed and aggressive as he acted in his campaign, and that
2. a Trump presidency might be better for international military politics, because Trump said that he would be reluctant to wage wars if they are costly, or to defend allies if they don't pay towards their defense.

Both of these ideas are mistaken and there is no reason for hope and optimism.

With concern to 1.: The question is not whether Trump might be more sensible than the way he made himself look in his campaign. The question is if there is any good reason to think that is more sensible. There isn't. He was consistently haphazard, offensive, chaotic, unprepared, and unprofessional.

With concern to 2.: I've read in many places that Trump wants to talk to Putin and that is a good thing. Saying this makes it obvious that many - even intelligent - people believe that the U.S. administration and military is not maintaining constant close discussions on many topics with Russia. This is of course a false idea. Russia and the U.S. don't collide on many issues because they don't communicate.
Also, people who think that when Trump said he would talk with Russia that was a considered, serious thing haven't listened to his other ideas. He is just sputtering populist phrases. Whatever works at the moment. He knows as much about strategy, military issues, and economic competition with Russia as about other topics: next to nothing. As soon as he is seriously briefed and informed, if he even understands what he is being told, which is not sure, he might change his mind.

The same is the case concerning his ideas that the U.S. shouldn't offer defense arrangements for Japan, South-Korea and the Philippines. There are three enormous confusions here:
i) the U.S. does not offer defense. Japan had to accept that the U.S. military is stationed there at the end of the occupation following WWII. South-Korea had to accept the troops after the Korean war. The Philippines used to be a de facto U.S. colony. Also, Japan and South-Korea pay huge amounts towards the maintenance of the bases that the U.S. troops are using and towards the costs of the U.S. military.
Third, it is far from obvious that these countries really wanted the U.S. to station their troops there. That the U.S. is there ensures that these countries collide in their diplomacy with their other neighbours, Russia and China. If the U.S. troops would not be there these countries would have much more space for diplomatic manouvering and for looking out for their own interests. It is however part of the U.S. position that there can't be any powerful opponents on its borders. Canada and Mexico are no threats, across the Atlantic is a bloc of NATO countries, and Japan and South-Korea, as well as the Philippines form a big buffer zone between the U.S. and China. If the U.S. does not want to change its major defense policies it won't give up on these alliances.

Hence, there are no good reasons to be optimistic about Trump's presidency if he goes through with anything he has said.