Ultranationalism is the extreme form of nationalism. Ultranationalists think that every methods, including the controversial or questionable methods, are necessary to promote a certain nation's interest.
Ultranationalists reject any ideologies or actions for perceived damaging national interest and defend any ideologies or actions for perceived protecting national interest.
Ultranationalism is not tied to certain political spectrum, despite fascism is considered as having high connection to the ultranationalism.