China has accused Britain of violating international law after the UK announced new sanctions targeting "individuals and groups supporting and funding Putin's war machine".
China's embassy said it firmly opposes the sanctions and has warned any action harming China's interests "will be met with a firm response".
In a statement, the embassy insisted Beijing had remained objective and fair on the war in Ukraine and urged the UK to "correct its mistakes and withdraw the sanctions on Chinese firms".
Forty-six new sanctions were announced by the UK, and the list of targets includes businesses in China, as well as firms in Belarus, Serbia, Turkey, the UAE and Uzbekistan, which the government said "continue to support Russia's illegal invasion of Ukraine".
The UK's sanctions targeted 31 people and entities it said were linked to the design and manufacture of drones and missile parts and the importing of electronic components.
Three Chinese entities, Asia Pacific Links Limited, Sinno Electronics Co., Limited, and Xinghua Co., Limited, were targeted for supplying sanctioned goods.
Four UAE-based entities it said were involved in trading Russian oil were also affected, as well as others linked to the Wagner mercenary group.
A Belarusian defence organisation the UK said had manufactured military technology used by Minsk to support Russia's war effort was also sanctioned.
"We will continue to ratchet up pressure on Putin and crack down on third parties providing restricted goods and technology to Russia, wherever they may be," junior foreign minister Anne-Marie Trevelyan said.
"Today's sanctions will hit Putin where it hurts, damaging Russian defence systems, and cracking down on illegal supply chains propping up Russia's war machine.
"Working alongside our G7 partners and international allies we will continue to ratchet up pressure on Putin and crack down on third parties providing restricted goods and technology to Russia, wherever they may be."
It brings the total number of sanctioned individuals to more than 1,600 with a further 250 entities.