Ukraine’s military fired several long-range American missiles into Russia this week on the 1,000th day of the war, marking the first time it has done so since Russia invaded back in early 2022.

Six American-made ATACMS missiles were used in the pre-dawn attack that struck an ammunition depot in Russia’s Bryansk region. Russia claimed it shot down five of the six missiles, but that information had not been independently verified.

The attack came just a couple of days after President Joe Biden authorized Ukraine to use America-made missiles for strikes inside Russia after resisting Ukraine’s requests to do so for many months.

Some analysts were concerned that the strikes represented an escalation in the war, while others believed that the strikes strengthened Ukraine’s negotiating position ahead of President-elect Donald Trump coming back into office. Trump has pledged to force a quick end to the war.

The New York Times reported that the event that changed Biden’s mind about Ukraine being able to use the missiles was North Korea sending thousands of soldiers into Ukraine to fight for the Russians.

A Ukrainian official said the strike hit warehouses containing “artillery ammunition, including North Korean ammunition for their systems.”

On the same day as the strike, Russian President Vladimir Putin lowered his country’s threshold for using nuclear weapons — a move that had been anticipated since at least September when it was first announced.

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The new doctrine states: “Aggression against the Russian Federation and (or) its allies by any nonnuclear state with the participation or support of a nuclear state is considered as their joint attack.”

The White House National Security Council was not surprised by Putin lowering the country’s threshold for using nuclear weapons, according to Fox News.

“Observing no changes to Russia’s nuclear posture, we have not seen any reason to adjust our own nuclear posture or doctrine in response to Russia’s statements today,” an NSC spokesperson said. “This is more of the same irresponsible rhetoric from Russia, which we have seen for the past two years.”

“As we said to Russia weeks ago, Russia’s use of DPRK soldiers in combat operations against Ukraine presents a significant escalation of its war of choice against Ukraine and we warned that the United States would respond,” the spokesperson added. “I won’t get into the details of that response today.”