Russia sends written response to U.S. as Ukraine negotiations continue

The U.S. has received a written follow-up response from Russia, according to a State Department spokesperson. But the Biden administration isn't revealing what Moscow said. 

The follow-up document comes after the U.S. responded to a list of Russian demands, amid Russia's military buildup near Ukraine. 

"It would be unproductive to negotiate in public, so we'll leave it up to Russia if they want to discuss their response," the State Department spokesperson said. "We remain fully committed to dialogue to address these issues and will continue to consult closely with our allies and partners, including Ukraine."