U.S. Secretary of State Antony Blinken spoke by phone on Monday with Ukrainian Foreign Minister Dmytro Kuleba, noting the Biden administration's "swift response" to Russia's decision to recognize Ukraine's separatists' regions as independent.

"They discussed the strong measures we announced today in response and reiterated that additional steps would be forthcoming," State Department spokesperson Ned Price said in a statement late Monday.

Blinken and Kuleba are scheduled to meet on Tuesday in Washington.

Kuleba earlier said he spoke with Blinken about sanctions.

"I underscored the need to impose tough sanctions on Russia in response to its illegal actions," Kuleba said on Twitter.

-ABC News' Chad Murray and Conor Finnegan

After the Russian envoy spoke at the U.N. Security Council’s emergency meeting Tuesday night, Ukraine’s envoy began his remarks by saying he was afraid to take off his mask not because of COVID-19 but “because of the virus that has so far no vaccine -- the virus that hates the United Nations and the virus that is spread by the Kremlin.”

That “virus” has infected the U.N. and threatens to kill it, Ambassador Sergiy Kyslytsya said in a stark warning.

“The United Nations is sick, that’s a matter of fact,” he said. “It’s been hit by the virus spread by the Kremlin. Will it succumb to this virus? It is in the hands of the membership.”

Kyslytsya warned it’s not just the U.N. that he believes is under threat. During his remarks, he held up a paper that had a copy of the Kremlin’s decree recognizing Russian-backed “breakaway” provinces from Georgia in 2008 and the decree issued Monday recognizing the separatist Donetsk and Luhansk, showing how they’re almost the exact same.

“Copy, paste. Copy, paste. No creativity whatsoever. The copying machine in the Kremlin works very well. Who is next among the members of the United Nations? The question is open,” he said.

Kyslytsya demanded that Russia “cancel” and remove “additional Russian occupation troops” in Ukrainian territory, and he insisted, “The internationally recognized borders of Ukraine have been and will remain unchangeable regardless of any statements and actions by the Russian Federation.”

“We are committed to a peaceful and diplomatic path, and we will stay firmly on it. We are on our land. We are not afraid of anything or anyone. We owe nothing to anyone, and we will not give away anything to anyone,” he said.

-ABC News’ Conor Finnegan

Ukraine called for “painful sanctions” against Russia in a statement released by its foreign ministry, noting that how the world responds may greatly influence Russia’s next move.

“Further decisions and steps of the Russian Federation largely depend on the world’s reaction to today’s events,” the statement read. “Therefore, we insist on imposing painful sanctions against Russia in order to send a clear signal of the inadmissibility of further escalation. It is time to act to end Russia’s aggression and restore peace and stability in Europe.”

The country reiterated that it is ready to defend itself, stating that it “understands Russia’s intentions and its desire to provoke Ukraine. We take into account all risks and do not succumb to provocations.”

Ukrainian Foreign Minister Dmytro Kuleba is currently in Washington and meets with U.S. Secretary of State Antony Blinken on Tuesday.

-ABC News’ Kirit Radia

In remarks during an emergency U.N. Security Council meeting Tuesday, Russian Ambassador Vasily Nebenzia dismissed “highly emotional” criticisms of Russia and said nothing has changed on the ground, while also blaming Ukraine for the decisions President Vladimir Putin’s decisions made earlier in the day.

Nebenzia dismissed “unfounded panic about an impending Russian invasion of Ukraine” — as Russian troops prepare to come across the border -- and painted Russia as a pacifist hero that welcomed refugees who were forced onto buses by Russian-led separatists.

“We’ve just heard a number of highly emotional statements, categorical assessments, and far-reaching conclusions,” he said during the emergency meeting. “I’ll leave the direct verbal assaults against us unanswered. Now it’s important to focus on how to avoid war and how to force Ukraine to stop the shelling and provocations against Donetsk and Luhansk.”

Russian-controlled separatists are responsible for the shelling and for staging the provocations, but Nebenzia worked to portray Ukraine as the aggressor and Russia as the force preventing war, despite it essentially seizing Ukrainian territory.