On October 9, Donald Trump sent a letter to Turkey's President Tayyip Erdogan urging Erdogan to work on the ongoing offensive against Kurdish troops in northeastern Syria.

Trump's language in the letter has received a great deal of attention around the world, and not least in Russia, the text is responding.

- It's not often you see such a language in writing when two heads of state are in contact, says spokesman Dimitrij Peskov.