The US has delivered hundreds of Stinger anti-aircraft missiles to Ukraine for the first time over the last few days, including over 200 on Monday, according to a US official and a congressional source briefed on the matter, CNN reported.

Earlier this year the US gave the green light to Baltic countries including Lithuania, Latvia and Estonia to send American-made weaponry that they have to Ukraine, including Stingers. But until now, the Biden administration had held off on the US providing the Stingers directly to Ukraine, while they have provided other lethal weaponry.

US Secretary of State Tony Blinken told reporters on Wednesday that at this time Ukraine is still able to receive “vital defensive military equipment” that it needs.

There are different generations of Stingers that the US produces, and the country’s officials have been cognizant of not providing the newest model to the Ukrainians in case they fall into the hands of the Russians who could steal the US technology.