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Ukraine President Volodymyr Zelenskyy declared martial law Thursday and announced the country had severed diplomatic ties with Russia after the giant neighboring nation launched a military invasion into Ukraine.

The president's actions came in a second video that Zelenskyy posted to social media as television images seen around the world showed Russia troops entering his country.

"Dear Ukrainians, this morning, President Putin announced a special military operation in the Donbas," Zelenskyy said. 

Zelenskyy was referring to one of the breakaway regions in eastern Ukraine targeted by the invasion and which Russian President Vladimir Putin has claimed share cultural and historical ties to Russia.

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"Russia has attacked our military infrastructure and our border guards," Zelenskyy continued. "Explosions were heard in many cities of Ukraine. We introduce martial law throughout the state."

Zelenskyy also said he had spoken with President Biden, who was gathering international support for Ukraine.

In an earlier video, Zelenskyy also made an appeal to Russian citizens as he explained his views on Russian aggression toward his country, saying he does not want a war but that his country will defend itself against hostilities.

"We have no need for another Cold War, or a bloody war, or a hybrid war," Zelenskyy said.

Ukrainian President Volodymyr Zelenskyy addresses the nation in a video Thursday morning from Kyiv. Zelenskyy declared martial law, saying Russia has targeted Ukraine's military infrastructure. He urged Ukrainians to stay home and not to panic. (Ukrainian Presidential Press Office via AP)

Ukrainian President Volodymyr Zelenskyy addresses the nation in a video Thursday morning from Kyiv. Zelenskyy declared martial law, saying Russia has targeted Ukraine's military infrastructure. He urged Ukrainians to stay home and not to panic. (Ukrainian Presidential Press Office via AP)

"Today I initiated a phone conversation with the president of the Russian Federation," he continued. "The result was silence – although it's the Donbas where there should be silence."

Although diplomatic ties have been cut, Zelenskyy said his administration’s ultimate goal is peace with Russia

"They say that Ukraine may pose a threat to Russia. This wasn’t a case in the past, nor is it now, and won’t be in the future. Our main goal is to maintain peace in Ukraine and keep Ukrainian citizens safe," Zelenskyy said.

He continued: "For this we are prepared to hold discussions with everyone, including you [Russia], in whatever format you like at whatever venue."

"If the leadership of Russia does not want to sit at the table with us to make peace, perhaps it will sit at the table with you. Does Russia want a war? I would very much like an answer to this question. But that answer depends only on you, citizens of the Russian Federation," he said.

In the video, Zelenskyy also encouraged his own citizens to remain steadfast.

Ukraine's President Volodymyr Zelenskyy, left, meets with President Biden in the Oval Office of the White House, Sept. 1, 2021, in Washington, D.C.

Ukraine's President Volodymyr Zelenskyy, left, meets with President Biden in the Oval Office of the White House, Sept. 1, 2021, in Washington, D.C. (Getty Images)

"But if we are attacked militarily, if they try to take away our freedom, our lives, our children’s’ lives, we will defend ourselves," he added. "When you attack, you will see our faces and not our spines, our faces."

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"Russian TV will surely not show this video, but the Russian people must watch it. The truth must be known. And that truth is that this all needs to stop now, before it's too late," Zelenskyy said.

Hours later, Russian forces launched missiles into Ukraine and invaded border cities, prompting another statement from the Ukrainian leader.

Ukrainian President Volodymyr Zelenskyy talks during a news conference in Paris on April 16, 2021, after a working lunch with the French president.

Ukrainian President Volodymyr Zelenskyy talks during a news conference in Paris on April 16, 2021, after a working lunch with the French president. (Getty Images)

"Stay calm, stay at home, the army is doing its work," Zelenskyy said, as videos of Kyiv show traffic jams of residents attempting to leave the city. 

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He added: "Don't panic. We are strong. We are ready for everything. We will defeat everyone. Because we are Ukraine."