Hungary has said it was blocking access to 12 Ukrainian news sites after a similar move by Kiev, worsening relations between the two neighbours that have been fraught during the Russia-Ukraine war.
Earlier this month, Ukraine blocked various websites deemed to contain pro-Russian views at the request of the security services. They included eight Hungarian-language portals, among them a popular pro-government news site origo.hu.
"A sovereign country must give a proportional response to an entirely unjustified attack," Hungarian Prime Minister Viktor Orban's chief of staff, Gergely Gulyas, said in a Facebook post on Monday, announcing the measure.
Most of the websites targeted by Hungary are widely read in Ukraine.
One, European Pravda, closely tracks Ukraine's EU accession aspiration.
Gulyas said Ukraine banned the Hungarian portals because they wrote critically about sanctions against Russia and military support for Ukraine, and criticised the European Union and NATO alliance for being fragmented and ineffective.
"If the fragmentation of the European Union provides grounds for state censorship in Ukraine, then it is time for Ukraine to renounce its intention to join," he wrote.
Gulyas said the Hungarian sites were also banned in Ukraine because they "dared to report on the influence activities of the Soros Foundation."
Orban has been sceptical about Western military aid for Ukraine.
There was no immediate response from Ukraine to Hungary's move to block the websites.
