Russian Visa Duration

I have a Russian 3 year multiple entry visa, on which is written "за шесть месяцев" (for six months). The police here say that the visa duration is 3 months on, 3 months off, but have agreed to check on this.

On the Russian consulate site, it also says 3 months off, 3 months on (90 days in a 180 day period), but this is a contradiction of what is written on the visa.

I have found an article titled, "Historic Visa Agreement Enters Into Force September 9, 2012" (http://moscow.usembassy.gov/pr_visas-082912.html), which states that,

For Americans in Russia, the agreement lifts the previous restriction limiting stays in Russia to 90 days within any given 180-day period—just like Russian travelers, they will now be permitted stays of up to six months. In addition, “exit visas” will no longer be necessary in the case of U.S. citizens who lose their passports while in Russia. (Russian citizens may already exit the United States without an exit visa). U.S. citizens with current Russian visas are reminded that they are still subject to the terms and dates of the visas already in their possession.

Unfortunately, this is on the U.S. Embassy site and not the Russian Embassy/Consulate site. Even worse, it is written in English, which no one here knows.

(http://moscow.usembassy.gov/russian-visas.html)

In October 2007, the Russian government made significant changes to its rules regarding the length of stay permitted to most foreign visitors. Visas issued for 3 years allow for a 6-month uninterrupted stay in the country. The break between the intervals may be as short as one calendar day.

I suppose, then, I am asking if anyone can find an official document stating that a 6 month duration is valid, and especially something in Russian?