While it may have been an act of war , the attack was made on a Japanese company. The attack, actually a raid rather than an invasion, was to put the Japanese mega companies on notice of what is to come.
North Korea wants something from Japan and the movie in America is the leverage applied to get results at home in Japan. Toyota, Hitachi, Mitsui, Toshiba...... are being encouraged to assert their will on the Japanese government to attain what ever the Norks are wanting.
At base, it is ordinary blackmail, extortion
Being a Japanese corporation, one would think they have friends and associates with the Yakuza and they could extract vengeance even in North Korea. Probably not very easy even for them but they could pull it off.
I agree-
This was an attack on SONY- and the Norks hate the
Japanese- even though Sony pictures is run by liberal
Americans- the Norks think SONY pulls the strings directly
- Remember- the NORKS sent a submarine to Japan-
TO KIDNAP AVERAGE CITIZENS!!!- to teach their commandos
a true Japanese dialect!- WTF!- they are one paranoid
crazy country