U.S. lawmakers were expected on Friday to approve new sanctions on Russian weapons companies and investors in the country's high-tech oil projects, putting more U.S. pressure on President Vladimir Putin for interference in eastern Ukraine.
Late on Thursday, the Senate and House of Representatives unanimously passed the Ukraine Freedom Support Act. A House panel made a small change and sent the bill back to the Senate for a last vote expected as soon as late Friday.
President Barack Obama has said he opposes further sanctions on Russia unless Europe is on board.
The bill, which will be sent to Obama to sign, requires him to apply sanctions on Russian state-owned arms exporter Rosoboronexport and other defense companies Congress says contribute to instability in Ukraine, Georgia and Syria.
It requires Obama to penalize global companies that make large investments in crude oil drilling projects in deep waters and the Arctic.
The legislation would also provide $350 million in military assistance to Ukraine from 2015 to 2017, and other aid for energy to the country, which has been threatened by cutoffs in natural gas supply from Russia.