Russian officials have been in contact with their Chinese counterparts about obtaining military equipment.
The Washington Post and The New York Times were told about the potential arms deal, but they did not know what type of weaponry Russia had requested.
The Times reported that Beijing has become a key ally of Russia as the world tries to ostracize it.
The request for help from Moscow was never heard of by the Chinese Embassy in Washington.
National security adviser Jake SullivanJake SullivanSunday shows preview: Russian invasion in Ukraine extends into third week Family of Marine detained in Russia says Biden declined meeting in Texas The Memo: Biden locks into battle with enigmatic Putin MORE, who is planning to meet Chinese counterpart Yang Jiechi this week, warned China on Sunday against providing any material support to Russia to help it cope with global sanctions.
Sullivan told CNN that there will be consequences for large-scale sanctions evasion efforts or support to Russia.
We will not allow that to happen and allow there to be a lifeline to Russia from these economic sanctions from anywhere in the world.
According to the Post, Russian Finance Minister Anton Siluanov said in a televised interview on Sunday that part of Russia's gold and foreign exchange reserves are in Chinese currency.
Siluanov said during his interview that Western countries are trying to limit mutual trade with China.
The partnership with China will allow us to maintain the cooperation that we have achieved and also increase it in an environment where Western markets are closing, he said.
Russia has been hit with sanctions from the U.S. and the U.K., with the U.K. recently saying they will phase out Russian oil, natural gas and coal imports.
The Post reported that some officials said that Russia is running low on some types of weaponry.
The spillover effects of Beijing offering military assistance to Moscow in the war in Ukraine could be huge.
There is an update at 6:08 p.m.