The United States on Saturday said it would rush up to $200 million in additional small arms, anti-tank and anti-aircraft weapons to Ukraine, as Ukrainian officials pleaded for more equipment to defend against heavy shelling by Russian Forces.

President Joe Biden on Saturday authorized the additional security assistance, the White House said, paving the way for the “immediate” shipment of new military equipment to Ukraine, a senior administration official said.

According to senior administration officials, Mr. Biden’s decision brings total US security aid provided to Ukraine to $1.2 billion since January 2021 and to $3.2 billion since 2014, when Russia annexed the Crimea region of Ukraine.

In a memorandum to Secretary of State Antony Blinken, Mr. Biden directed that up to $200 million allocated through the Foreign Assistance Act be designated for Ukraine’s defense.

Mr. Blinken said he had authorized the fourth drawdown of US defense stocks, in line with Mr. Biden’s directive, “to help Ukraine meet the armored, airborne, and other threats it is facing” as the war entered the third week.

He lauded the “great skill, iron will, and profound courage” been shown by the Ukrainian armed forces and citizens and said the United States would also continue to provide humanitarian assistance to those in need.

“The United States and our allies and partners stand in solidarity with the people and government of Ukraine in the face of the Kremlin’s aggression,” he said in a statement. “The International community is united and determined to hold (Russian President Vladimir) Putin accountable.”

Russia says it is engaged in a “special military operation” that it says is not designed to occupy territory but to destroy its neighbor’s military capabilities and “de-Nazify” Ukraine.

The Funds “will provide immediate military assistance to Ukraine, including anti-armor, anti-aircraft systems, and small arms in support of Ukraine’s front-line defenders,” one of the US officials said, speaking on condition of anonymity.

Ukraine has been asking for more Javelin anti-tank weapons and Stinger missiles to shoot down aircraft.

On Saturday, Ukraine’s foreign minister, Dmytro Kuleba, underscored Ukraine’s need for additional military supplies in an interview with the non-profit Renew Democracy Initiative.

The United States has drawn from US weapons stocks to supply Ukraine repeatedly, beginning in the fall of 2021 and then again in December and February.

The last batch of US weapons provided in February included anti-armor, small arms, body armor, and various munitions, according to the Pentagon, as well as anti-aircraft systems.

On Thursday night, the US Congress approved $13.6 billion in emergency aid for Ukraine as part of a $1.5 trillion measure to fund the US government through September.