Ukraine’s allies will look to pressure China over North Korea’s growing support for Russia’s war during the Group of 20 Summit in Brazil, according to people familiar with the matter.

The allies are extremely concerned about North Korea’s decision to send troops to fight against Ukraine, and believe the deepening cooperation between Vladimir Putin and Kim Jong Un could have consequences on the security balance in the Indo-Pacific region, said the people, who asked not to be identified to discuss private assessments. The U.S. is expected to adopt more sanctions against North Korea before Joe Biden leaves office, the people added.

According to the assessment of a nation in the Group of Seven, China is unlikely to be pleased with the alliance between Russia and North Korea, the people said. The upcoming G20 summit in Rio will be an opportunity to push the issue with Beijing, said the people, without providing more specifics.