[light3]

What are the chances Putin didn't write the article?

[Smirnoff]

I have seen Putin talk on TV a few times and I can totally see Putin say this "in Russian."

He probably had someone to write it down and translate the speech for him. So I have no doubt that Putin was the author of the speech/letter.

[JacobSkyler]

He probably directed the writing of the article but I doubt he actually sat down and wrote it with his own hand.

[ihsw]

There are some grammatical and capitalization errors, and numerous comma splices (stringing similar sentence fragments together in an effort to form a coherent statement). There was also usage of very short sentences in repeated succession.

Those are mostly stylistic issues but they're indicative of non-native grasp of the English language.

Furthermore it's clearly written by someone with enough capability to express themselves eloquently and succinctly, but as mentioned it's clearly non-native.

[sytelus]

That's very interesting. Any resources/research that you know about on how to identify non-native writing?

[sesm]

Of course, Putin's speechwriter is likely to be Russian.