Washington: Anti-Kremlin activist William Browder said Monday he had been blocked from flying to the United States after Russia placed him on an Interpol wanted list.

Browder, a Briton based in London, said the move was in retaliation for his support of Canada’s passage last week of its “Sergei Magnitsky Law,” which targets Russian officials for human rights violations and is named for a former employee of Browder who died in a Russian prison after exposing massive corruption.

“Putin adds me to Interpol wanted list in retaliation for passage of Canadian Magnitsky Act,” he tweeted.

“Unless Interpol lifts this notice, I will be arrested at any international border I cross on Putin’s orders,” Browder added.

Browder, head hedge fund manager at Hermitage Capital Management, said that as a consequence his “Global Entry” membership for expedited immigration into the United States had been revoked and there were “problems” with his visa.

Browder said it was the fifth time Moscow had tried to place his name on an Interpol warning list.

This time was successful, he said, because they put him on a less rigorously vetted “diffusion notice” that can alert other countries of a wanted person’s location or request the person’s arrest.

A US official suggested this may have automatically sparked warnings in US immigration systems, leading airlines to prevent Browder from traveling.

But a spokeswoman for the US Customs and Border Protection agency said that Browder continues to be approved for entry into the country under the “ESTA” automatic visa waiver program.

“His ESTA was manually approved by CBP on October 18 — clearing him for travel to the United States,” she said.