In this file photo dated Monday, Oct 21, 2019, a member of the US Army's 1st Armoured Battalion of the 9th Regiment, 1st Division from Fort Hood in Texas prepares an Abrams battle tank as they arrive for Atlantic Resolve operation at the Pabrade railway station some 50 km (31 miles) north of the capital Vilnius, Lithuania. (PHOTO / AP)

KIEV — Ukrainian President Volodymyr Zelensky confirmed Monday that his country has received US Abrams battle tanks.

"Abrams are already in Ukraine and are preparing to reinforce our brigades. I am grateful to the allies for fulfilling the agreements," Zelensky said in a post on Telegram, without specifying the modifications made to the tanks or the exact quantity that has been delivered to Ukraine.

Aid to Ukraine has been one of the core issues in the US Congress deadlock over the next financial year's budget

US President Joe Biden in January announced that the United States would send 31 Abrams tanks to Ukraine.

READ MORE: Biden announces new military aid worth $325m for Ukraine

Operated by a four-person crew, Abrams is a US-designed third-generation battle tank with a range of up to 420 km.

Biden on Thursday announced a new military aid package worth 325 million US dollars for Ukraine, including more air defense weapons. This announcement was made during Zelensky's visit to Washington.

Aid to Ukraine has been one of the core issues in the US Congress deadlock over the next financial year's budget, which may lead to a US federal government shutdown after Sept 30.

READ MORE: Pentagon: US to train Ukrainian pilots on F-16 fighters in Sept

Since February 2022, U.S. military aid to Ukraine has totaled 43.9 billion dollars, according to US government figures.