Russia says Sosniuk was detained for trying to obtain classified information.
Russia’s FSB security service detained a Ukrainian diplomat in St. Petersburg on Saturday, Ukraine’s foreign ministry said Saturday, citing the latest escalation of tensions between neighboring countries.
The Interfax news agency had earlier quoted the FSB as saying that Oleksandr Sosnyuk had been detained while trying to obtain classified information from Russian law enforcement databases during a meeting with a Russian citizen.
“This action is inconsistent with the dignity of the diplomatic staff and is against the Russian Federation. Foreign diplomats will be dealt with in accordance with international law, “the FSB said in a statement.
Ukraine’s foreign ministry said Sosnyuk had been detained for several hours but had now returned to the country’s consulate in St. Petersburg.
It added, “The Ukrainian side will soon decide how to respond to this provocation, considering the current practice.
In recent years, Russia has detained a number of Ukrainian citizens on suspicion of espionage, but it is rare to detain a diplomat.
Tensions are rising between Moscow and Kiev over the formation of Russian troops on the border and clashes between the army and pro-Moscow separatists in eastern Ukraine.
Kiev has been fighting Russian-backed separatists in eastern Ukraine since 2014, and the conflict has escalated since the beginning of the year after a ceasefire was agreed in July.
On Friday, Ukrainian President Volodymyr Zelensky called for peace talks.