The U.K. targets more oligarchs and Putin allies with sanctions.

The British government said on Tuesday that it had imposed sanctions on more than 370 individuals it described as oligarchs, political allies or propagandists for President Vladimir V. Putin of Russia, a major new crackdown that brings it closer in line with the European Union on an issue that has long dogged Britain.

The sanctions, announced by the foreign secretary, Liz Truss, include a travel ban and will freeze the assets of prominent Russians in business and government, including some of the wealthiest oligarchs and most senior officials in the Kremlin.

Among those on the latest list: Dmitri A. Medvedev, the former president of Russia; Prime Minister Mikhail Mishustin; Dmitri S. Peskov, the Kremlin press secretary; Maria Zakharova, a spokeswoman for Russia’s foreign ministry; Sergei Shoigu, the defense minister; and Mikhail Fridman, the billionaire founder of Alfa Bank, one of Russia’s largest private banks.