Kyiv said it had uncovered a network of agents inside Ukraine working for Hungarian military intelligence, a first in the country’s history.

The SBU, Ukraine’s intelligence service, accused the alleged spies of collecting information about the military security of the Transcarpathian region and searching for vulnerabilities in the ground and air defense there.

Moreover, the agents were tasked with learning the views of local residents, in particular how they would respond if Hungarian troops entered the region, the SBU said.

Authorities made two arrests, a man and a woman, both former servicemembers of Ukraine, accused of passing information to their Hungarian handlers in exchange for money. They face life imprisonment if convicted.

Newsweek has contacted the Hungarian foreign affairs ministry for comment via email to its press department.

Hungary subsequently “expelled two spies working under diplomatic cover at the Ukrainian embassy in Budapest,” said Péter Szijjártó, Hungary’s minister of foreign affairs and trade, in a statement to the MTI news agency.

Szijjártó said the government “will not tolerate such smear campaigns being launched in Ukraine against Hungary and the Hungarian people.”