“Russia calls on Western countries to influence the regime in Kyiv so that it abandons its dangerous plans that threaten international peace and security,” TASS quoted the text of the document.
Nebenzya warned of grave consequences and massive losses for the population as a result of the provocation.
The letter notes that Moscow calls on Guterres to do everything in his power to prevent the crime.
The Russian diplomat stressed that the country would consider Ukraine's use of a "dirty bomb" as an act of nuclear terrorism.
Earlier, Dmitry Polyansky, First Deputy Permanent Representative of Russia to the UN, said that the Russian side would send a letter to the Secretary General of the United Nations António Guterres against the background of information that appeared about the risk of using a “dirty bomb” by Kyiv.
The UN, commenting on the data on the preparation of a provocation by Kyiv, called on all parties to avoid actions that could lead to escalation and miscalculations.