"We can assure that the illegal attempts to occupy our property will not remain without an adequate response," Tyapkin said.
The diplomat noted that "a huge amount of work has been done" to solve the problem of real estate in Russian-Polish relations.
"However, the unilateral actions of the Polish authorities will unambiguously nullify all efforts to resolve the problem, including the preparation of an intergovernmental agreement, and can finally bury the negotiation process on this issue," the diplomat added.
Last week, Poland's foreign ministry applied to the competent government authorities with a submission to initiate enforcement proceedings in respect of two real estate objects, including the school building at the Russian embassy, "that are not used for diplomatic and consular purposes and are illegally owned" by Russia.