Perhaps martial law can be avoided, but it is necessary to act against the Left on grounds of high treason. By one means or another the Democratic Party must be proscribed and eliminated. The MSM must be broken up. The bankers must also be arrested and eliminated. In short the threat from the Left must be eliminated.
There must be confrontation at some point. Trump may remain essentially as a figurehead if he will not fight, but his Administration must be cleansed of the Globalist traitors by some means. For the moment the first line of defense is to save the Trump Administration and prevent another four years of harassment and attack on that Administration from the Left.
That defense will likely require the use of force at some point. Seeing that the force used is clearly defined in intent and in action may be tricky. Still, it will be necessary. Initiation of violence should be seen as coming from the Left which will justify counter action.
By all means organize militia where possible. Certainly avoid indiscriminate violence and if martial law means indiscriminate violence avoid it, but do not shrink from violence either. The modern, organized Left represents the greatest threat to liberty since WWII and may be even greater as its presence is felt in some 180+ countries around the world. We face a struggle for global domination. The Left is not just an American problem. This is not a matter to be treated lightly. We, who oppose the Left, are in mortal peril. Let this not be forgotten.
As for foreign intervention in US affairs by the Globalists, I cannot think of a greater justification for total war. I really doubt that there is sufficient willingness abroad to strike the US directly. Economic embargo may be another matter, but other countries. have resisted US sanctions. The US will just have to get used to doing the same.
Frankly, enforced autarchy would be a prime mover in the effort to rebuild domestic industry and put America back to work. In any case this is not a time for fear of anything. There is work to be done.