Vyacheslav Kovalenko halted his diplomatic duties after Tbilisi's arrest in late September of four Russian military intelligence officers accused of spying on pro-Western Georgia.
The arrests followed months of deteriorating ties during which Moscow blocked the sale of Georgian wine and mineral water in Russia.
The spy accusations prompted Russia to intensify the dispute, blocking postal and financial communications with Georgia and forcing many ethnic Georgians to leave Russia.
The resumption of Kovalenko's diplomatic duties is seen as a first step toward normalizing ties between Moscow and Tbilisi.
