'We have additional photos and videos of various meetings organised by the Hungarian Military National Security Service on Hungarian territory... We have documented it all', the Ukrainian leader said.
The move signals a dangerous escalation in the government’s further crackdown on independent civil society and press freedom.
In his New Year's greetings, the Ukrainian president highlighted that the unity of Europe must be respected " by Budapest and Bratislava.
Viktor Orbán’s political director suggested that Hungary might have responded differently to a Russian invasion than Ukraine has.
According to the former US president, Orban said, “Russia was afraid of him. China was afraid of him. The whole world was at peace.”
Earlier this week, Orbán visited Kyiv, where he urged Zelensky to consider a ceasefire to seek an end to the war with Russia.
An internal report, obtained by 444 shows the extent of Russian hacking operations targeting Hungary's Foreign Ministry.
Szijjártó and the head of Zelesky's office agreed on the importance of improving relations between Hungary and Ukraine.
Matthew Miller, spokesperson for the U.S. State Department, said the US was trying to work with the Hungarian government to give them an opportunity to correct the situation but they refused.
One of the few EU leaders who declined to applaud the Ukrainian President was Hungarian Prime Minister, Viktor Orban.
The incident illustrates how Hungary has become a hub for Russian intelligence.