Russia on Saturday promised it would respond harshly to what it said was Poland's illegal seizure of its embassy school in Warsaw, an act it called a flagrant violation of the Vienna Convention on diplomatic relations.
Polish state-run news channel TVP Info earlier reported that police showed up outside the Russian embassy school in Warsaw on Saturday morning.
When asked about the incident, a Polish foreign ministry spokesperson told Reuters the building housing the embassy school belonged to the Polish state.
Russia's foreign ministry said in a statement that the Polish authorities had entered the embassy school's grounds with the aim of seizing it.
"We regard this latest hostile act by the Polish authorities as a blatant violation of the 1961 Vienna Convention on Diplomatic Relations and as an encroachment on Russian diplomatic property in Poland," the ministry said.
"Such an insolent step by Warsaw, which goes beyond the framework of civilized inter-state relations, will not remain without a harsh reaction and consequences for the Polish authorities and Polish interests in Russia," it said.
Russia's Investigative Committee said late on Saturday on the Telegram messaging app that it will give "a legal assessment" of the "seizure," but it did not provide any further details.
Lukasz Jasina, a Polish foreign ministry spokesperson, told Reuters that it was Russia's right to protest but that Poland was acting within the law.
"Our opinion, which has been confirmed by the courts, is that this property belongs to the Polish state and was taken by Russia illegally," he said.
Sergei Andreyev, Moscow's ambassador to Poland, had earlier told Russian state news agencies that the building housing the embassy school was a diplomatic one which Polish authorities had no right to seize.
The two countries' fraught relations have soured further over the war in Ukraine with Warsaw positioning itself as one of Kyiv's staunchest allies, playing a leading role in persuading allies to provide it with heavy weaponry.
In March 2022, shortly after Russia invaded Ukraine, Poland said it was expelling 45 Russian diplomats suspected of working for Moscow's intelligence services.
