Russian President, Vladimir Putin has visited the newly unearthed remains of medieval Russian prince.

Putin visited the open sarcophagus of medieval warrior prince Dmitry Donskoy on Thursday. The remains were recently uncovered during restoration work at Moscow's Cathedral of the Archangel.

Lying within the Kremlin fortress, the Orthodox cathedral served as the burial site for more than 40 Russian tsars and princes down the centuries.

The body of Grand Prince Donskoy was known to lie there, but its discovery last month in a crypt by the southern wall surprised historians, who had believed it was located elsewhere in the building.

Putin lit a candle inside the frescoed cathedral and stood beside the white-stone sarcophagus as experts explained how they had identified the remains as those of the 14th-century prince, RIA news agency reported. The Russian Orthodox Church announced the discovery on Tuesday, saying the well-preserved remains were nearly complete and belonged to a man of just under 180 cm (5 feet 11 inches), who had died of natural causes between the ages of 35 and 45.

"All these characteristics correspond with written sources and historical testimony concerning the life and death of the grand prince," it said.

Donskoy, who died in 1389 aged 39, ruled the principalities of Muscovy and Vladimir, which would later become the core of the Russian state.

A prominent figure in Russian history, Donskoy oversaw the construction of the first stone Kremlin fortress, increased the territory of Muscovy, and routed forces of the Mongol horde in a famous battle near the Don river in 1380.

Meanwhile, The Kremlin said on Thursday there is no information yet on a possible visit to Moscow by U.S. presidential envoys Jared Kushner and Steve Witkoff.

Negotiations between Russia and the United States to bring about an end to the conflict in Ukraine have largely stalled amid the war in Iran, which Witkoff and Kushner are also working to end.

Separately, Kremlin spokesman Dmitry Peskov said there was no planned meeting yet between President Vladimir Putin and a Vatican envoy, Paul Richard Gallagher, who will visit Moscow next week.

But Peskov added that Russia highly values efforts of those countries working to find an end to the Ukraine conflict.