Russian internet trolls appear to be shifting strategy in their efforts to disrupt the 2020 U.S. elections, promoting politically divisive messages through phony social media accounts instead of creating propaganda themselves, cybersecurity experts say.

The Kremlin-linked Internet Research Agency may be among those trying to circumvent protections put in place by companies including Facebook Inc. and Twitter Inc. to find and remove fake content that hackers created to sow division among the American electorate in the 2016 presidential campaign.

"Instead of creating content themselves, we see them amplifying content," said John Hultquist, the director of intelligence analysis at FireEye Inc. "Then it's not necessarily inauthentic, and that creates an opportunity for them to hide behind somebody else."