In this letter from 1697 to the Dutch States General, Tsar Peter the Great 1697 announces the arrival of a Russian mission in the Netherlands. Not mentioned in the letter, the mission included Peter himself travelling incognito to acquire knowledge of Dutch crafts such as shipbuilding.
"States General, 1550-1796" (reference code: 1.01.03), no. 7366, National Archives of the Netherlands (The Hague).