Russian news agencies say the meeting could take place later today.
The United Nations has condemned the killings. A statement from UN Secretary-General Kofi Annan called them "heinous" and said no cause could justify them.
An Al-Qaeda-linked group has claimed responsibility for killing the four men, who were abducted on June 3 in Baghdad. A fifth Russian died during the kidnapping.
The kidnappers had demanded that Russia pull its forces out of Chechnya and release Muslims held in Russian jails.