Zhang Xueliang hates Japanese to core. Japanese killed his father and he joined KMT hoping the bigger forces can take on Imperial Japan. To his disappointment. Chiang is more interested in fighting communist than Japanese. It is Chiang instruction to Fengtian army to ask them to step down against Japanese in Manchuria. Xueliang kidnapped Chiang and forced him into a united front against Japanese.Chiang cannot command a single Manchurian army in 1931, just like he cannot command all the other warlords.
The traitor is Zhang Xueliang.
Get your facts right.
Who is the traitor? Anybody who knows Chinese history will know the answer.