Interfax news agency cited Russian envoy on Afganistan Zamir Kabulov as saying on Wednesday.
Russia considers inefficient the current format of the talks, sponsored by the four-power group of Pakistan, Afghanistan, the United States and China, and does not plan to join in, although Moscow is ready to create a new format, he said, Reuters reported.
The Afghan government refused to take part in the talks just a week after a massive bomb blast in Kabul killed at least 64 people and wounded hundreds on April 19.