Japan's industry ministry says domestic companies are facing growing cybersecurity risks following Russia's invasion of Ukraine.

The government is urging businesses, organizations and other entities to review their supply chains, and take adequate security steps.

Private-sector research firm Teikoku Databank surveyed more than 1,500 companies in Japan between March 11 and 14. It found that 28.4 percent of the respondents detected cyberattacks on their systems within one month prior to the survey.

Targeted businesses include not only large companies, but also overseas subsidiaries and smaller firms that are part of supply chains.

The National Police Agency says 146 companies and organizations suffered damage from ransomware attacks last year. It says 79, or 54 percent, of them were small and mid-sized firms.

Ransomware is a computer virus programmed to encrypt data in infected computers and demand money in return for decryption.

Some major Japanese companies came under cyberattacks after Russia's invasion of Ukraine began on February 24. They are believed to have been subjected to ransomware attacks.

One cyberattack caused a system failure on February 26 at Kojima Industries, a parts supplier for Toyota Motor. The automaker suspended operations at all of its plants across Japan on March 1.

Tire maker Bridgestone also had to suspend operations at several factories in the Americas after its subsidiary Bridgestone Americas detected a cyber-incident on February 27.

Auto parts maker Denso experienced unauthorized access to its group company network in Germany on March 10.

Confectionery maker Morinaga also experienced unauthorized access to several of its servers on March 13. The incident impaired some segments of its internal IT system, and affected the manufacturing of some products.