Conclusion: You don't have to speak British English in international communications, but you have to speak English itself clearly.
Related contents:
1. Note 121 [English]아름다운 한국어를 공부해야 되요?
2. Note 025 To all the non-native speakers of English - You don't have to use correct English.
3. The video version of this episode: [Note 104] You don't have to speak British English.
4. What is necessary to get higher proficiency of English? — detailed version
