English Language Etiquette for Russians: Advice-points on written English #1: Clarity

The author begins:

One of the main points I make to Russian students of English is that it is much harder to write well than to speak fluently. English is such an international language these days that we have become tolerant of different ways of (mis-)using it—in speech. But when it comes to writing, poor English still looks decidedly деревенский. 

And concludes:

To write English well, is to write it in a way which anyone who is vaguely literate can understand. The habit of openness and accessibility, which is not always obvious in Russian journalism, is one of the reasons why English is so widely-used around the world today