Diplomatic relations between the U.S. and Russia have hit a new low and tensions could lead to cyber-war, additional U.S. sanctions and more, risk consultancy Eurasia Group warned on Sunday.

October 7 would be remembered as “Black Friday in US-Russia relations,” Eurasia Group analysts Cliff Kupchan, Jonathan Lieber and Mujtaba Rahman and Paul Triolo said in a note.

The comments come after the U.S. on Friday accused the Russian government of directing hacks into U.S. political organizations in a bid to “interfere” with the electoral process.

Source: ‘Black Friday’ in US-Russia relations could unleash ‘cyber-skirmishes’ and more.