The US will provide up to $US250 million ($366 million) in arms and equipment to Ukraine in the final package of aid for 2023 to help Kyiv in its war with Russia, Secretary of State Antony Blinken says.

President Joe Biden has asked Congress to provide another $US61 billion ($89 billion) in aid to Ukraine, but Republicans are refusing to approve the assistance without an agreement with Democrats to tighten security along the US-Mexico border.

The White House has warned that without the additional appropriation, US aid will run out by the end of the year for Ukraine’s fight to retake territory occupied by Russian forces since it invaded in February 2022.

“Over the course of this year, the US has provided 34 military aid packages worth over $24 billion … We will always be grateful for all of this support,” Ukrainian President Volodymyr Zelensky said on Thursday on social media platform X.

Blinken said the latest aid package included air defence munitions, additional ammunition for high-mobility artillery rocket systems, artillery ammunition, anti-armour munitions and more than 15 million rounds of ammunition.

Zelenskiy said it would cover “Ukraine’s most pressing needs”.

Congress has approved more than $110 billion for Ukraine since Russia’s invasion, but it has not approved any funds since Republicans took control of the House of Representatives from Democrats in January 2023.