[1][2] His extant diary and letters contain detailed information on the court of Ivan V of Russia.

[2][4] He participated in the border commission with Russia in Keksholm, but the negotiations ended when the Russian commissioners walked out on the talks.

On 10 November 1668 he arrived at the Russian border at Orlina, where he was escorted to Novgorod.

In his letter from Novgorod to the Swedish government he writes: "Russians inevitably must be impelled to such unusual höflighetsbetygelser either under pressure from the enemy side or from fear of his friends."

[9] Charlotta and Henrick had as their son, Henrik Magnus Buddenbrock.