North Korea's latest missile strike has shown that Kim Jong-un might not be that mad after all

For reasons that remain obscure, the Japanese chose not to shoot down the missile as it passed through their airspace. If Kim was testing the resolve of his nervous neighbours he found them, satisfyingly for him, weak

www.independent.co.uk/voices/editorials/kim-jong-un-japan-shinzo-abe-north-korea-america-china-a7918756.html

What does 'satisfyingly for him' mean?