Actress Ino Menegaki, dressed as a high priestess, who lit the flame in Ancient Olympia last Sunday, lit a torch from a cauldron inside Athens' Panathinaiko Stadium. The flame, placed in a lantern, was handed over to Hellenic Olympic Committee president Spyros Kapralos. He passed it to Russian Deputy Prime Minister Dmitry Kozak.
After a seven-day run through Greece, the flame will cover 40,000 miles on Russian soil. The record-setting relay will start on Monday in Moscow, in a ceremony attended by Russia President Vladimir Putin, and will finish in Sochi on Feb.
The flame will travel through all 83 Russian regions, from the enclave of Kaliningrad in the west, to Chukotka, the region facing Alaska, to the east.
A few dozen activists at the Acropolis staged a peaceful protest Saturday against Russia's law banning gay propaganda.
In a brief speech before the handover of the flame, Kozak referred to the "difficult road" the games organizers and the IOC had travelled from the day the Olympics were awarded to Sochi in 2007. Kozak said organizers had undertaken "the biggest investment project in the history of the Olympic Games."
The Sochi Olympics are projected to be the costliest. Spending on infrastructure is projected at $50 billion, up from the $12 billion estimate at the time the city won the bid.
"We will fulfill all the engagement we have undertaken to the Olympic movement," Kozak added.
The Winter Games have drawn the criticism of rights activists who have pointed to discrimination against gays in Russia and a recent law banning "homosexual propaganda." The International Olympic Committee has warned participating athletes not to make a public issue of it during the games.
Inside Panathinaiko Stadium, two activists silently raised a rainbow flag, but there were otherwise no demonstrations during the ceremony.
On Saturday afternoon, as the flame moved from the Acropolis, where it had stayed overnight, to a cauldron inside the courtyard of the Acropolis Museum, a few dozen gay rights activists gathered on the museum's steps in a peaceful protest. Some held rainbow flags, while others held a banner reading "Homophobia is not in the Olympic Spirit" and "Love is not Propaganda."
Another banner mentioned "Putin's victims" allegedly beaten, raped or murdered for being gay.
"The Olympics should have taken a stand against this law in Russia because the Olympic ideals are for supporting human rights and diversity and that's not what's happening in Russia," said protester Zak Kostopoulos.
Associated Press writer Derek Gatopoulos and APTV's Theodora Tongas and Raphael Kominis contributed.