Lack of military assistance from Petro Doroshenko, strong Moscow garrisons in the Left Bank cities and pressure from the pro-Moscow part of the officers and the Orthodox clergy prompted Demian Ihnatovych to negotiate with the tsarist government.

On December 17, 1668, by the decision of the Novhorod-Siversky Cossack Council, Ihnatovych headed the government in the Left Bank and on behalf of all the officers continued negotiations with the tsar.

In 1689, Demian Ihnatovych took part in the negotiations of the Ambassador of Muscovy Fyodor Golovin with China, which ended with the signing of the Treaty of Nerchinsk.

A monument to Hetman Demian Ihnatovych was unveiled on October 20, 2016 in the Selenginsky district of Buryatia at the intersection of the Ulan-Ude-Kyakhta and Ulan-Ude-Dzhida roads, near Novoselenginsk.

On December 14, 2018, a memorial sign in honor of the 350th anniversary of the election of Demian Ihnatovych as Hetman of the Left Bank of Ukraine was erected on the territory of the Savior-Transfiguration Monastery in Novhorod-Siversky.