The War Drums are Banging Louder than Ever

Kim Jong -Un and Donald Trump are banging the war drums. Is this just another war or is it a just war.
In the 13th century St Thomas Aquinas presented the outline of the present day, traditional, Just War Theory.
The six conditions for a Just War are:
The war must be for a just cause.
The war must be lawfully declared by a lawful authority.
The intention behind the war must be good.
All other ways of resolving the conflict should have been tried first.
There must be a reasonable chance of success.
The means used must be in proportion to the end that the war seeks to achieve.
A war that starts as a Just War may stop being a Just War if the means used to fight it are inappropriate.
Innocent people and non-combatants should not be harmed.
Only appropriate force should be used. This applies to the type of force used, and how much force is used.
Internationally agreed conventions regulating war must be obeyed.
Many people would emphasise that war should be a last resort.
The Just War Theory has been criticised as being too general and imprecise and open to a variety of interpretations.
The key to understanding and applying The Just War Theory is to tease out what the key words and phrases in the theory mean.
What is a just cause? Is it protection? Is it retaliation? Is it to improve living conditions? Is it to provide rights? Is it to increase power or wealth?
What is a lawful authority? Can a recognised authority become unlawful or unjust? What about Nazism?
What makes an intention good?
At what point does war become a last resort? Is this open to interpretation?
What is a reasonable chance of success? Who decides this?
What constitutes reasonable force?
When do a means to an end become unreasonable?
The war drums are banging but are they banging for justice?