Moscow expects to receive a written reply from Washington to its demands on security guarantees next week, the Interfax news agency quoted Russian Deputy Foreign Minister Sergei Ryabkov as saying on Friday.
Ryabkov said Russia blamed the United States for the fact that bilateral ties were close to a "dangerous critical line", but hoped to persuade Washington to change its approach.
Russia denies planning an attack, but says it could take unspecified military action if a list of demands are not met, including a promise from NATO never to admit Ukraine.
