Leaders of the big telecommunications companies were summoned to the White House to discuss strategies for overhauling the security of the nation’s telecommunications networks amid growing alarm at the scope of a Chinese hack.

The Dallas-based company had said in a regulatory filing in April that a cybercrime group was responsible for a data breach. The gang added Frontier to its leak site on June 1.

Claro Company, the largest telecom operator in Central and South America, disclosed being hit by ransomware. Representatives shared this information in response to the service disruptions in several regions. From the ransom note it becomes clear that the attackers are Trigona ransomware.

Russian hackers were inside Ukrainian telecoms giant Kyivstar's system from at least May last year in a cyberattack that should serve as a "big warning" to the West, Ukraine's cyber spy chief told Reuters.

The hack, one of the most dramatic since Russia's full-scale invasion nearly two years ago, knocked out services provided by Ukraine's biggest telecoms operator for some 24 million users for days from Dec. 12.

Cyber attacks hit the Assembly of the Republic of Albania and telecom company One Albania, a government agency reported.