Russia is pressing demands that the US give it access to two diplomatic compounds seized in the US last year.
Kremlin spokesman Dmitry Peskov said it was unacceptable to set preconditions for returning the properties. Foreign Minister Sergei Lavrov described the move as "daylight robbery".
In December the US expelled 35 Russian diplomats and shut the compounds over suspicions of meddling in US elections.
Russian and US officials are discussing the issue in high-level talks.
US Undersecretary of State Thomas Shannon is hosting Russian Deputy Foreign Minister Sergei Ryabkov in Washington.
The meeting was meant to have been held in June in St Petersburg, but was cancelled after the US government added 38 individuals and organisations to its list of sanctions over Russian activity in Ukraine.
Mr Peskov suggested that there was nothing to discuss.
"We consider it absolutely unacceptable to place conditions on the return of diplomatic property, we consider that it must be returned without any conditions and talking," he said.
Mr Lavrov said that this was not the way decent and well-brought-up people behaved.
"How can you seize property which is protected by a bilateral, inter-governmental, ratified document and, to return it, act according to the principle 'what is mine is mine, and what is yours we'll share'?" he said during a visit to Belarus.
Which compounds were seized?
- The US seized a Russian diplomatic property on Maryland's Eastern Shore - a sprawling 45-acre (18.2-hectare) retreat. The facility, acquired during the Cold War, was used by Russian diplomats for recreation, such as tennis and swimming. But it also had sophisticated communications, and US officials said it doubled as a spying outpost
- The other diplomatic property is a New York mansion at Glen Cove, Long Island. It has 49 rooms and is similarly surrounded by woods. Like the Maryland mansion, its location is ideal for eavesdropping on US communications, US officials say