South Korea, the US and Japan called for stronger international support of efforts to ban North Korea from sending workers abroad and curb the North’s cybercrimes as a way to block the country’s means to fund its nuclear program.

The top South Korean, US and Japanese nuclear envoys met in Seoul on Friday in their first gathering in four months to discuss how to cope with North Korea’s growing nuclear arsenal.

The North’s recent weapons tests show it is intent on acquiring more advanced missiles designed to attack the US and its allies, rather than returning to talks.

Despite 11 rounds of UN sanctions and pandemic-related hardships that have worsened its economic and food problems, North Korea still devotes much of its scarce resources to its nuclear and missile programs.

Contributing to financing its weapons program is also likely the North’s crypto hacking and other illicit cyber activities and the wages sent by North Korean workers remaining in China, Russia and elsewhere despite an earlier UN order to repatriate them by the end of 2019, experts say.

In a joint statement, the South Korean, US and Japanese envoys urged the international community to thoroughly abide by UN resolutions on the banning of North Korean workers overseas, according to Seoul’s Foreign Ministry.

The ministry said a large number of North Korean workers remains engaged in economic activities around the world and transmits money that is used in the North’s weapons programs.

It said the three envoys tried to call attention to the North Korean workers because the North may further reopen its international borders as the global COVID-19 situation improves.

It is not known exactly how many North Korean workers remain abroad. But before the 2019 UN deadline passed, the US State Department had estimated there were about 100,000 North Koreans working in factories, construction sites, logging industries and other places worldwide.