Ukraine and Hungary said on Friday they were expelling two diplomats each after each side accused the other of engaging in espionage.

Ukraine says it has expelled two Hungarian diplomats hours after the country’s main security agency said that it had arrested two people on suspicion of spying for Hungary by gathering intelligence on Ukraine’s military in the west of the country.

Tensions exist between Ukraine and Hungary, whose leader Viktor Orbán is sympathetic to Russia and skeptical of Western intervention in the Ukraine war.

Ukraine’s Western allies led by the United States have stepped up pressure on Russian President Vladimir Putin on Friday, threatening further sanctions if Moscow fails to agree to a 30-day ceasefire in Ukraine.

President Volodymyr Zelenskiy of Ukraine, Swiss Federal President Viola Amherd and Head of the Presidential Office of Ukraine Andriy Yermak applaud during a session of the Summit on Peace in Ukraine,

Ukraine's President Volodymyr Zelenskiy said on Wednesday that his country stood by its offer to observe a 30-day ceasefire in the war with Russia, while Russia's Foreign Ministry rejected suggestions that Moscow had opposed or was hindering efforts to introduce such a pause in hostilities.