Jake Sullivan, the national security adviser for the US, warned China that there would be “serious costs” if they tried to aid Moscow with deadly weapons to support Russia in its conflict with Ukraine.

He said the US is not simply issuing threats in diplomatic discussions with China. We’re merely outlining the risks involved, the repercussions, and the course of events. And we are doing that specifically and openly in a private setting.

Sullivan’s remarks are made at a pivotal time in the conflict in Ukraine. According to three officials familiar with the intelligence, the US has information that the Chinese government is considering giving Russia munitions and drones for the conflict.

Since invading Ukraine, Russia has repeatedly requested drones and ammunition from China, the sources familiar with the intelligence said. The Chinese leadership has been expected to discuss whether it is the right decision to send lethal weapons to Russia.

Sullivan also reaffirmed Biden’s statement from Friday that the administration was concerned about sending F-16 fighter fighters to Ukraine.

When asked what Congress could do to pressure the Biden administration to give Ukraine longer-range missile systems, such as ATACMS or F-16s, the Texas Republican said on ABC.

However, Sullivan clarified that the United States would never recognise Russia’s alleged annexation of the peninsula. Ned Price, the department’s spokesperson, referred to Russia’s 2014 annexation of Crimea as a breach of international law and Ukraine’s sovereignty and territorial integrity.

However, Sullivan did not make clear the Biden administration’s support for Ukraine, concluding that triumph meant retaking Crimea.

He told Bash, “The Ukrainians will decide what happens with Crimea, in the framework of this war and a settlement of this war and with the help of the United States.