Russia-Ukraine updates: Putin suspends key US-Russia nuclear treaty in speech denouncing West

Russian officials said Ukrainian President Volodymyr Zelenskyy's visit on Wednesday to Washington, his first trip out of his country since the invasion began 10 months ago, amounted to political theater.

Other officials in Moscow warned that the U.S. was "continuing down the path" toward getting further involved in the conflict.

"We can say with regret that so far neither President Biden nor President Zelensky have said even a few words that could be perceived as potential readiness to listen to Russia's concerns," Kremlin spokesman Dmitry Peskov said. "America is continuing down the path toward a de facto and indirect war with Russia until the last Ukrainian."

He added, "The U.S. and other countries are going to expand the range of arms supplies to Ukraine; this does not contribute to a fast resolution. Arms supplies to Ukraine prolong the suffering of the Ukrainian people."

Russia's ambassador to the United States, Anatoly Antonov, said the visit showed that neither Zelenskyy nor the U.S. were "ready for peace."

"The Hollywood-style trip to Washington by the head of the Kyiv regime has confirmed that the administration's conciliatory statements about the lack of intention to start a confrontation with Russia are just empty words," Antonov said.

-ABC News' Tanya Stukalova

As President Volodymyr Zelenskyy travels to Washington, calls for the United States to take a larger role in the conflict are continuing.

The Institute for the Study of War called on Tuesday on the West, led by the United States, to stop expending resources trying to change a reality it does not control and instead focus on what it can shape plenty: Denying Russia’s ability to wage a war against Ukraine.

Instead of focusing on Russia's inflexible and maximalist intent in Ukraine, "the United States must help Ukraine liberate its territories and people through a large-scale counteroffensive or risk facing the same challenge with the same escalation risks under worse conditions," the ISW said, warning of the dangers of a Russian military foothold in Ukraine.

-ABC News’ Edward Szekeres

Plans are underway for Ukrainian President Volodymyr Zelenskyy to visit the U.S. Capitol on Wednesday, sources told ABC News.

The speech comes as the U.S. is set to announce a military aid package for Ukraine that includes Patriot air defense systems, U.S. officials told ABC News .

Zelenskyy previously addressed Congress via video on March 16, roughly three weeks into the war with Russia.

U.S. officials told ABC News that the next military aid package for Ukraine will be announced Wednesday and that it will include Patriot air defense systems and JDAM precision bomb kits.

-ABC News' Luis Martinez