Russia, Ukraine talks conclude, massive explosion rocks Kyiv: LIVE UPDATES

United States will impose more sanctions on Russia if Moscow continues to escalate its conflict with Ukraine, State Department spokesperson Ned Price said on Monday.

"We will do more, assuming the Russian Federation continues to escalate, and we have seen no indication at this point that the Russian Federation is prepared to do otherwise," Price added, according to Reuters.

A United States senator confirmed that Russian forces have fallen behind their timeline for the Ukrainian invasion, after a classified briefing on the war.

"Confirmation that the Russians have fallen behind their timeline. Ukrainian resistance has been fierce and there have been multiple Russian equipment and logistics failures," Sen. Chris Murphy, D-Conn., who chairs the Senate Appropriation's Committee's Subcommittee on Homeland Security, wrote on Twitter.

Jesse Watters rebuked "Russia's sickening assault" on Ukraine, as the war continues for a fifth straight day.

"Ukrainian forces have been slowing Putin's advances. It's David versus Goliath as they follow the example of their brave president," the "Jesse Watters Primetime" host said.

Russia is very likely to default on foreign debt and its economy will suffer a double-digit contraction this year after the West launched sanctions unprecedented in scale and coordination, a global banking industry lobby group said on Monday.

"If we stay here and this (the crisis) escalates, then default and restructuring is likely," Elina Ribakova, the lobby group's deputy chief economist told reporters during a media call.

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A video shared with Fox News Digital shows bombing in Kharkiv, Ukraine's second-largest city.  About 1.4 million people live in the city, which is located less than 30 miles from the Russian border.

Satellite imagery provided by Maxar shows a large Russian military convoy heading towards the Ukrainian capital of Kyiv.

The convoy is approximately 40 miles long, stretching from Antonov airport in the south to Prybirsk.

Additional images show increased military activity in southern Belarus, with ground attack helicopters spotted less than 20 miles from the country's border with Ukraine.

Russia voiced safety concerns for diplomatic staffers employed in embassies in the United States and Canada on Monday amid protests near the facilities over its invasion of Ukraine.

During a meeting with U.S. ambassador John Sullivan in Moscow, Russian Deputy Foreign Minister Sergei Ryabkov commented on demonstrations outside its embassy in Washington D.C., Reuters reported. 

He asked Sullivan to ensure the safety of workers at the facility. Ryabkov also called in Canada's ambassador to Moscow over demonstrations in Ottawa and two other consulates.

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International Criminal Court Chief Prosecutor Karim Khan said Monday he will open an investigation into Russian war crimes in Ukraine "as rapidly as possible."

The investigation will look into any alleged crimes before the Russian invasion, with Khan noting in a statement that it is my intention that this investigation will also encompass any new alleged crimes falling within the jurisdiction of my office that are committed by any party to the conflict on any part of the territory of Ukraine.”

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Ukrainian ambassador to the U.S. Oksana Markarova said Monday that Russia used a bomb "prohibited by the Geneva convention" in Ukraine.

"They used the vacuum bomb today, which is actually prohibited by the Geneva convention," after a briefing with members of Congress, according to Reuters. "The devastation that Russia is trying to inflict on Ukraine is large."