I made a small change to the inc files for Sweden and Muscovy. St. Petersburg should be owned by Sweden, not Russia. The area was captured by Russia during the Great Northern War.
If you are speaking about the year of 1500, you are not right. Russia gained that territory as a result of annexation of Novgorod in the XVth century. In 1500 it was Russian. Then the province, most of it, was lost to the Swedes as a result of the Livonian war in 1583. But it was no way Swedish at the beginning of the century.