Where were most of those stations located? In non-urban areas, particularly in norther regions of the nation (that means Siberia). If the data from those areas was excluded, then it would have given a false result, showing warming when none really existed. The IEA believes that of all the data were used then the so-called warming trend would disappear.
The IEA believes that Russian meteorological-station data did not substantiate the anthropogenic global-warming theory. Analysts say Russian meteorological stations cover most of the country’s territory, and that the Hadley Center had used data submitted by only 25% of such stations in its reports. Over 40% of Russian territory was not included in global-temperature calculations for some other reasons, rather than the lack of meteorological stations and observations.
To say this allegation is throwing even more cold water on the 'theory' of Anthropogenic Global Warming would be an understatement.