Ukrainian President Volodymyr Zelenskyy warned European superpowers that the fate of the continent is being determined by the conflict currently unfolding in Ukraine.

The future of global security and democracy in Europe are currently being decided in Ukraine, Zelenskyy said during his nightly address on Monday.

"The lessons of history are well known," he said. "If you are going to build a millennial Reich, you lose. If you are going to destroy the neighbors, you lose. If you want to restore the old empire, you lose. And if you go against the Ukrainians, you lose."

Ukraine Minister of Foreign Affairs Dmytro Kuleba tweeted Monday that Russia is attempting to make it seem like the world is on the brink of World War III because it has lost its "last hope to scare the world off supporting Ukraine."

"Thus the talks of 'real danger' of WWIII," Kuleba wrote "This only means Moscow senses a defeat in Ukraine."

-ABC News' Max Uzol and Christine Theodorou

In an interview with Russia's Channel One, Russian Foreign Minister Sergey Lavrov said NATO weapons supplied to Ukraine are essentially a proxy war and that Russian troops will consider the Ukrainian warehouses storing the weapons as legitimate targets.

"Of course, these weapons will be a legitimate target for the Russian armed forces, which operate as part of a special armed operation. And warehouses, including in western Ukraine, have become such targets more than once," Lavrov said Monday. "If NATO, in fact, goes to war with Russia, through a proxy, and arms this proxy, then in war as in war."

Lavrov also claimed that "the real position of Ukraine is determined in Washington, London and other Western capitals."

"Therefore, our political analysts say, why talk with [Ukrainian President Volodymyr Zelenskyy]'s team, we need to talk with the Americans, negotiate with them, reach some kind of agreement," Lavrov said.

-ABC News' Natalia Shumskaia

Russian forces have carried out five strikes targeting Ukraine railway stations, according to the head of the state-run Ukrainian railways, Oleksandr Kamyshin.

The hardest hit were the towns of Zhmerynka and Kozyatyn, where five people were killed and 18 were injured, according to Serhii Borzov, the head of the Vinnytsia regional military administration.

No casualties were reported in the other railway strikes, which were in the Lviv, Rivne and Zhytomyr regions, officials said.

-ABC News' Natalya Kushnir, Fidel Pavlenko and Christine Theodorou

United Nations Secretary-General António Guterres is traveling on Monday to Moscow, where on Tuesday he will have a working meeting and lunch with Russian Foreign Minister Sergey Lavrov followed by a meeting with Russian President Vladimir Putin, a deputy spokesperson for the secretary-general said.

On Thursday, Guterres will visit Ukraine where he'll meet with Ukrainian President Volodymyr Zelenskyy and Ukrainian Foreign Minister Dmytro Kuleba.

-ABC News' Christine Theodorou

White House national security advisor Jake Sullivan hinted Thursday of more sanctions coming against Russia in the "next week or two" aimed at targeting ways Moscow is evading sanctions already imposed.

“Where our focus will be over the course of the coming days is on evasion,” Sullivan said Thursday at the Economic Club of Washington. “As Russia tries to adjust to the fact that it’s under this massive economic pressure, what steps do they take to try to evade our sanctions and how do we crack down on that? And I think we'll have some announcements in the next week or two that identify targets that are trying to facilitate that evasion both inside Russia and beyond."

When Sullivan was asked whether sanctions will automatically be lifted if a negotiated peace deal between Russia and Ukraine is worked out, he appeared cautious with his words, saying, “a lot of that depends on what the shape and scope” of the agreement is.

“A lot of it depends on what the Ukrainians, in consultation with us and the Europeans come to agree to," Sullivan said. "You know, we're not going to do a deal over the head of the Ukrainians where we give a bunch of sanctions relief to Russia. But if some measure of sanctions relief were built in to some credible diplomatic solution led by the Ukrainians, that's something that we would happily discuss."

But Sullivan said Russian oligarchs shouldn't expect to ever get back their yachts and other assets seized under sanctions that have been imposed, saying the ultimate goal is "not to give them back” once the war is over.

“The president is actively looking at how we can deal with the fact that as we seize these assets, our goal is not to give them back. Our goal is to put them to a better use than that," Sullivan said. "But I'll be careful in what I say today because there's an ongoing kind of policy process around how we end up dealing with that question. But, rest assured, that the goal is not just to sit on them for a while."

-ABC News' Justin Gomez