However, he was accepted by Polish intelligence and served as a translator of Russian documents.

It was first mentioned in Russian documents around 1992.

Russian documents first mention it as Serdovol or Serdobol in 1500.

According to recently obtained Russian documents, Pak was still alive as late as the summer of 1956.

Russian documents opened to the public in March 2003 showed that the KGB had changed their own investigation of the accident.

Russian documents from this time record information about different tribal groups that contributed to the composition of modern Tuvans.

Hanoi immediately denied the accuracy of the Russian document, saying it was a "fabrication."

A 1995 Russian document suggested a complete production facility had been transferred to Shanghai, for the development of a nuclear-armed cruise missile.

Unfortunately the Russian documents, which could clear up this crucial question, have not been published.

The 12th century is poorly documented in Sweden, and Russian documents are fragmented.