Hackers have targeted Ukrainian state institutions about 6,500 times in the past two months, including incidents that showed Russian security services were waging a cyberwar against the country, President Petro Poroshenko said on Thursday.
In December, Ukraine suffered attacks on its finance and defense ministries and the State Treasury that allocates cash to government institutions. A suspected hack also wiped out part of Kyiv's power grid, causing a blackout in part of the capital.
"Acts of terrorism and sabotage on critical infrastructure facilities remain possible today," Poroshenko said during a meeting of the National Security and Defense Council, according to a statement released by Poroshenko's office.
The statement said the president stressed that "the investigation of a number of incidents indicated the complicity directly or indirectly of Russian security services waging a cyberwar against our country".
Relations between Kyiv and Moscow collapsed in 2014 following Russia's annexation of Crimea and support for pro-Russian separatists in eastern Ukraine, where fighting continues despite a ceasefire agreement.
Among the 6,500 attacks Poroshenko said the country had been hit by, the attack on the State Treasury halted its systems for several days, meaning state workers and pensioners had been unable to receive their salaries or payments on time.
Cyber security firm CrowdStrike said last week a hacking group linked to the Russian government likely used a malware implant on Android devices to track and target Ukrainian artillery units from late 2014 through 2016.
Its findings are the latest to support a growing view among Western security officials and cyber security researchers that Russian President Vladimir Putin has increasingly relied on hacking to exert influence and attack geopolitical foes.
Russia has repeatedly denied hacking accusations.
Poroshenko's comments come as the Obama administration plans to announce retaliatory measures against Russia for hacking into U.S. political institutions and individuals and leaking information in an effort to help Donald Trump win the presidency. Trump has dismissed the assessments of the U.S. intelligence community.
In December 2015, Ukrainian regional power company Prykarpattyaoblenergo reported an outage, saying the area affected included the regional capital Ivano-Frankivsk. Ukraine's state security service blamed Russia.
Experts widely described that incident as the first known power outage caused by a cyber attack. The U.S. cyber firm iSight Partners identified the perpetrator as a Russian hacking group known as "Sandworm".
As a result of the cyber attacks, Ukraine's security council agreed measures to protect state institutions, the statement said. It did not disclose what the measures were.
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