The U.S. is concerned Russia could step up sanctions breaking activities with North Korea following stricter implementation from Beijing, Washington’s Ambassador to the UN said on Tuesday.

Speaking in Washington DC, Nikki Haley said the U.S. needs to keep pressure on Beijing while also warning Moscow could support Pyongyang in lieu of China.

“I’m concerned that Russia may backfill North Korea… We don’t have proof of that, but we are watching that carefully,” Haley said.

“We just need to keep the pressure on China, we need to keep our eyes on Russia, and we need to continue to let the