- Russia's Prime Minister Dmitry Medvedev, who attended Monday's forum in Turkmenistan, said that the ratification is expected "in the near future."
Iranian Vice President Eshaq Jahangiri was non-committal, making no commitments in his speech at the forum.
Jahangiri argued that non-Caspian nations shouldn't meddle in the region's affairs and charged that the United States' unilateralist policies and its emphasis on sanctions threaten stability of the region.
Turkmenistan's President Gurbanguly Berdymukhamedov told the forum that the Caspian energy riches should provide a powerful incentive for the region's development.
Turkmenistan and Azerbaijan have yet to agree on how to share the reserves under the seabed. That has impeded progress of the Trans-Caspian natural gas pipeline that would carry Turkmen gas across the sea to Azerbaijan and further on to Western markets.
"It's a very sensitive issue," said Bahram Huseynov, a vice president of Azerbaijan's state oil company SOCAR. "No concrete steps have been made yet and it's too early to discuss specifics."
Huseynov added that demilitarization of the sea border between Azerbaijan and Turkmenistan could facilitate the talks on dividing the energy riches.
Last year, the leaders of Russia, Iran, Azerbaijan, Turkmenistan and Kazakhstan signed a convention aimed at ending decades-long uncertainty over exploitation of its resources.
The agreement establishes rules for declaring each country's territorial waters and fishing zones, but the issue of dividing seabed that contains rich oil and gas fields is subject to further negotiations.
Iran and Russia are yet to ratify last year's agreement.