Poisoned Russian activist delivers rebuke of Putin regime in Senate testimony

Said the West has "not taken a principled, firm stand against Russia’s actions."

Wednesday's hearing of the Senate Appropriations Subcommittee on State, Foreign Operations, and Related Programs was to make the case for a counter-Russia financial account that would help states and organizations fighting back against the Putin regime.

Kara-Murza opened his testimony by listing current issues of oppression in Russia including lack of free and fair elections, silencing independent media outlets and designating some non-profits doing work there as foreign agents or spies.

He said there are currently 100 political prisoners in Russia and, after tens of thousands of people marched through the streets in different cities across Russia over the weekend, more than 1,500 people were arrested.

Kara-Murza said he thinks the U.S. should be honest about what’s happening in Russia and not "enable corrupt or abusive behavior" and "continue to engage with Russia’s civil society."

He said he believes Western democracies have given Putin a pass to interfere in elections because they "have not taken a principled, firm stand against Russia's actions."

The size of protests in Russia last week show that young people the country no longer trust Putin's regime, he said, calling his regime "a dead end for Russia."

ABC's Elizabeth McLaughlin contributed to this report.