President Biden’s announcement that the U.S. is sending "more advanced rocket systems and munitions" to Ukraine is a move that is "adding fuel to the fire," Russia warned Wednesday. 

Biden said the weaponry is part of the latest military aid package for Ukraine, but stressed that his administration is not enabling the Ukrainians to strike outside their own border. 

It's the 11th package approved so far and will include helicopters, tactical vehicles, Javelin anti-tank missiles, Stinger antiaircraft missiles, and other advanced weapons.  

"We have moved quickly to send Ukraine a significant amount of weaponry and ammunition so it can fight on the battlefield and be in the strongest possible position at the negotiating table," the president wrote in an op-ed for the New York Times on Tuesday. 

Kremlin Spokesman Peskov

Kremlin spokesman Dmitry Peskov attends a joint news conference of Russian President Vladimir Putin and Belarusian President Alexander Lukashenko in Moscow, Russia, in February. (Sputnik/Sergey Guneev/Kremlin via REUTERS)

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But Kremlin spokesperson Dmitry Peskov said "we believe that the United States is purposefully and diligently adding fuel to the fire," according to Reuters. 

When asked by reporters on how Russia could respond if Ukraine uses the U.S. rockets to strike Russian territory, Peskov reportedly added "let’s not talk about worst-case scenarios." 

Russia military fires rockets at Ukrainian troops

In this handout photo released by Russian Defense Ministry Press Service released on Wednesday, June 1, the Russian military's Uragan multiple rocket launchers fire rockets at Ukrainian troops at an undisclosed location.  (Russian Defense Ministry Press Service via AP)

Senior U.S. officials told Reuters that the U.S. agreed to provide Ukraine the rockets – which can strike targets as far away as 50 miles – after Kyiv gave "assurances" they wouldn’t use them to strike Russian soil. 

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However, Peskov, according to the news agency, said Moscow doesn’t trust any assurances. 

Ukrainian servicemen prepare unexploded Russian ammunition for destruction in the outskirts of Kyiv, Ukraine, on Wednesday, June 1.

Ukrainian servicemen prepare unexploded Russian ammunition for destruction in the outskirts of Kyiv, Ukraine, on Wednesday, June 1.

Russia’s invasion of Ukraine began on Feb. 24 and has now lasted 98 days. 

Fox News’ Paul Best contributed to this report.