Ahead of the Trump-Kim summit in Singapore next week, U.S. cybersecurity researchers say that Russian and Chinese hackers are scaling up cyber-espionage operations against South Korea.

Cybersecurity giant FireEye found that operations targeting South Korean government ministries and financial institutions were carried out as recently as last month. The firm uncovered multiple incidents of hacking attempts linked to Russian and Chinese advanced persistent threat (APT) groups.

The revelations underscore the complicated threat landscape facing Seoul as leaders of the U.S. and North Korea prepare to discuss that country’s nuclear programs. It is still unclear who exactly was targeted and whether the attackers succeeded in breaching important political organizations, FireEye researchers said.

Source: Chinese, Russian hacking groups spy on South Korea amid U.S.-North Korea peace talks