Who ruled Russia when the Treaty of Nerchinsk was negotiated in 1689, Sophia or Peter?

Answer 1

It was a combination rule of Peter and Ivan V, although Ivan V was not really a player, furthermore Peter's Mother helped control the russian affairs. Her last name is "Naryshkina", so im pretty sure the treaty was signed with peter and his mother, based on the following two pieces of info.

"By the summer of 1689, Peter had planned to take power from his half-sister Sophia, whose position had been weakened by the unsuccessful two Crimean campaigns. When she learned of his designs, Sophia began to conspire with the leaders of the streltsy. Unfortunately for Sophia, Peter, warned by the Streltsy, escaped in the middle of the night to the impenetrable monastery of Troitsky; there he slowly gathered his adherents and others, who perceived he would win the power struggle. She was therefore overthrown, with Peter I and Ivan V continuing to act as co-Tsars. Peter forced Sophia to enter a convent, where she gave up her name and position as a member of the royal family.

Still, Peter could not acquire actual control over Russian affairs. Power was instead exercised by his mother, Nataliya Naryshkina. It was only when Nataliya died in 1694 that Peter became truly independent. Formally, Ivan V remained a co-ruler with Peter, although he was still ineffective. Peter became the sole ruler when Ivan died in 1696."

"Treaty of Nerchinsk...It was signed on August 27, 1689"

Answer 2

Looks like Sophia...
http://en.wikipedia.org/wiki/Sophia_Alekseyevna
http://en.wikipedia.org/wiki/Treaty_of_Nerchinsk