Boris Johnson, the British Prime Minister, said that Putin had crossed a red line with his invasion of Ukraine.
The U.K. heaped more sanctions on key Russian sectors as it said they were fueling Putin's war machine.
Speaking to reporters as he arrived for a NATO summit in Brussels on Thursday, Johnson said that more sanctions were needed against strategic industries, banks and business elites.
It is important that we work together to get this done. The conflict can be ended more quickly if the sanctions are harder and more done to help Ukraine.
The NATO summit will be followed by meetings of EU leaders and the G-7 nations on Thursday. World leaders are looking at how they can provide more assistance for the war-torn nation after a month of Russian bombardment.
65 new Russian sanctions were announced by the U.K. on Thursday, targeting a range of key strategic industries and individuals that are supporting Russia's invasion.
The organization of Russian mercenaries reportedly tasked with assassinating Ukrainian President Volodymyr Zelenskyy, the U.K., has been targeted by the sanctions.
Alfa Bank, which was founded by Russian billionaires, is one of six banks being targeted.
Eugene Shvidler, the billionaire oil tycoon, and the founder of Tinkoff bank, are among the individuals who have been slapped with sanctions. The chief executive of Russia's largest bank Sberbank and the step daughter of the Foreign Minister have also been hit with sanctions.
The first time an individual has been sanctioned for collaborating with Russian forces is with Galina Danilchenko, who was installed by Russia as themayor of Ukraine.
The Foreign Office said that the U.K. has imposed over 1,000 sanctions on Russians since the invasion.
The British Foreign Secretary said that the people who are involved in the murder of innocent civilians are guilty and that they pay the price. We are united with our allies and will continue to tighten the screws on the Russian economy to make sure Putin fails in Ukraine. There will be no let-up.
She said that the assets of those who were sanctioned today will be frozen in the U.K. No U.K. citizen or company can do business with them, and individuals subject to travel bans are not allowed to travel to or from the U.K.
The U.K. has imposed sanctions on 500 billion dollars of the banks since the invasion, and the net worth of the family members is in excess of 150 billion dollars.
The U.K. has led the international sanctions effort, cutting off whole sectors of the Russian economy by targeting its defence companies, trade and transport sector, and working with allies to exclude Russia from the SWIFT financial system.
A view of East London from an aerial view.Much of the wealth held by Russians in London comes from ill-gotten gains and investments in the U.K. property market.
The government said last month that it was working on a plan to tackle dirty money.
There is no place for dirty money in the U.K. In February, Johnson said that those backing Putin would have nowhere to hide their ill-gotten gains.