Ahead of a key international arbitration court ruling next Tuesday over China's territorial dispute in the South China Sea, Beijing has unleashed an unprecedented English-language public relations push to tell its side of the story.

Newspapers across the world have carried editorials by Chinese ambassadors, while social media have been blanketed with videos, tweets and Facebook posts presenting the government's stance.

The ruling by a tribunal at The Hague centers on the applicability of China's vaguely drawn "nine-dash line" South China Sea boundary under the United Nations Convention of the Law of the Sea.