KYIV - US President Joe Biden made an unannounced visit here on Monday, one day after demonstrators rallied in Washington to protest against the United States' war-mongering foreign policy and its role in various conflicts across the globe.

Biden held talks with his Ukrainian counterpart, Volodymyr Zelensky, about the situation on the frontline in Ukraine and announced an additional $500 million in military aid for Ukraine on top of the more than $50 billion already promised, a move that is widely believed to further escalate the Ukraine crisis.

While speaking at a joint press conference with Zelensky, Biden said the new assistance package will consist of missiles for High Mobility Artillery Rocket Systems (HIMARS) and Javelin anti-tank missile systems, as well as more military equipment and weapons.

The United States and its allies have already committed nearly 700 tanks and thousands of armored vehicles and 1,000 artillery systems, among other aid to Ukraine, Biden said.

For his part, Zelensky said the war must end with the full de-occupation of Ukrainian territories and security guarantees for Ukraine.

Biden's trip, which came four days ahead of the first anniversary of the outbreak of the Russia-Ukraine conflict, is designed to show solidarity with Ukraine.

The brief visit also came at a time when more people in the United States and beyond are growing wary of the US role in the year-long conflict.

Hundreds of protesters on Sunday afternoon slammed the United States' role of "war machine" in overseas wars at a rally before the Lincoln Memorial in Washington, DC.

Organizers said the anti-war rally was planned to protest against massive money being funneled into Ukraine, as well as the United States' role in the Russia-Ukraine military conflict.

"Billions of taxpayers' dollars are being torched at the altar of US hegemony, the military-industrial complex, and a corrupt Congress," a release read.

The protesters then marched to the White House after the rally, chanting slogans like "No NATO, no war."

Public distrust of US authorities has also been fueled by a hazmat train derailment in a Ohio village on Feb 3 and a deadly Texas train derailment on Feb 13.