As a sign of mutual assistance in recognition of the authority of Tsar Alexei Mikhailovich over Ukraine, Hetman Bohdan Khmelnitsky sent the Cossack corps of Ivan Zolotarenko (about 20,000 people in the Nizhyn, Chernigov and Starodub regiments) to support the Russian troops.

The defenders of Bykhiv did not limit themselves to defensive actions and during the siege lasting from September 8 to November 26, 1654, they made numerous raids on Cossack positions, inflicting severe losses on them.

Zolotarenko did not dare to undertake any assault on the city at that time and limited himself to blocking it, counting on the fact that the defenders, cut off from their rear and deprived of hope for relief, would finally decide to capitulate.

Even the three-week stay of Alexei Trubetskoy 's 10,000 corps in July and August 1655 did not contribute to the capture of the fortress, because the defenders heroically repelled subsequent attacks, inflicting heavy losses on the enemy.

[4][5] In June 1659, Muscovite troops under the command of Ivan Ivanovich Labanov Rostovsky and Semen Zmiyev began a siege of the fortress, which they were unable to capture for several months.