Drop the language barrier pls. First of all, we don't know if the interview with the "controller" is real. Second, even if it is, most probably he's referring to crews of other a/c that arrived later with Polish officials and relatives of the President. An alleged ATC to crew recording that circulated on the net was not from PLF101, but IGA703, SAAB 340 with Mr. Kaczynski's twin brother and his party's officials. Crew had problems with Russian, mixing some English words, but landed safely. There's no chance that Tupolev crew had problems with Russian - flying there often, having materials in Russian, and being over 30, they must have had Russian in school. And basic words like numerals are so similar that it's impossible not to understand them.
The supposed "Russian procedure" of not monitoring is implausible. Bad CRM - probable, but no monitoring at all - not really.