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The top U.S. and Russian diplomats made no major breakthrough at talks on Ukraine on Friday but agreed to keep talking to try to resolve a crisis that has stoked fears of a military conflict, Reuters reported. 

After the talks in Geneva, U.S. Secretary of State Antony Blinken warned of a "swift, severe" response if Russia invades Ukraine after massing troops near its border. Russian Foreign Minister Sergei Lavrov said Moscow was still waiting for a written response to its demands for security guarantees.

But both said they were open to further dialogue, and Blinken saw grounds to hope that mutual security concerns could be addressed.

"Based on the conversations we've had -- the extensive conversations -- over the past week and today here in Geneva I think there are grounds for and a means to address some of the mutual concerns that we have about security," Blinken said. He described the talks as "frank and substantive" and said Russia now faced a choice.

"It can choose the path of diplomacy that can lead to peace and security, or the path that will lead only to conflict, severe consequences and international condemnation," Blinken told reporters, adding that diplomacy would be preferable. Lavrov said the ball was in Washington's court.

Describing the meeting as open and useful, he said Moscow would understand whether talks were on the right track once it had received a written response to its sweeping security demands from the United States.