He is my friend, also my colleague (I'm one level higher and with more working year experience than him). Recently we have a lot of different opinions. Everytime when I speak up my mind and point the cons, he feels I undermining him and make he feels humiliated in meeting room. He don't want me to questioning him on whatever decision that he has make. So, I step back and just play a roles as advisor when he ask me question and only answer to 'that' question, no more no less. This has been continue peacefully for >2months. Today, I receive his mail where I stanned and need your advise to a proper answer that not hurting each other. I need you travel to China and list of things I need your on-site help in china 1. Help system testing 2. Help plan and execute system cutover 3. Help implement processes that are approved (where I have a lot of different opinion where the fight are started) 4. Advise on service center & team's matters 5. Help finalize the internal processes and form