WASHINGTON, March 3 (Reuters) - The United States on Thursday imposed sanctions against Russian oligarchs as it targeted Russia's super-rich and others close to President Vladimir Putin, further ratcheting up financial pressure over Moscow’s invasion of Ukraine.

The United States imposed full blocking sanctions on eight oligarchs and officials, including Russian tycoon Alisher Usmanov, taking aim at those who have amassed fortunes and political influence through their connections to Putin.

"We want (Putin) to feel the squeeze, we want the people around him to feel the squeeze," White House spokeswoman Jen Psaki told reporters on Thursday.

The sanctions are the latest in a series announced by Washington, including against Putin and Russia's central bank, after Russian forces invaded Ukraine in the biggest assault on a European state since World War Two. Moscow calls the assault a "special operation."

Washington imposed sanctions on Usmanov, founder of Russian mining company Metalloinvest, whom the White House described as a “one of Russia’s wealthiest individuals and a close ally of Putin.”

The sanctions block his property from use in the United States and by U.S. persons, including his luxury yacht, which the White House said was seized by Germany, and his private jet.

The U.S. Treasury Department took the rare step of including in what are normally textual news releases a pair of photos of Usmanov's super-yacht and private jet.

Kremlin spokesman Dmitry Peskov, whom the White House accused of being "a top purveyor of Putin's propaganda," was also targeted.

Nikolay Tokarev, chief executive of energy giant Transneft, was designated along with his wife, daughter and his two luxury real estate companies.

Billionaire brothers Boris and Arkady Rotenberg and several family members were also hit with sanctions, as was Igor Shuvalov, a Russian politician and Putin's former deputy prime minister who heads the State Development Corp.

Yevgeniy Prigozhin, previously targeted for alleged attempts to interfere in U.S. elections, was designated again. The Treasury described him as the Russian financier of the Internet Research Agency (IRA) and said his "influence apparatus is reportedly supporting Russian Government designed influence operations within Ukraine."

"Treasury is committed to holding Russian elites to account for their support of President Putin’s war of choice," Treasury Secretary Janet Yellen said in a statement.