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US President Joe Biden has agreed to provide Ukraine with advanced rocket systems that can strike with precision at long-range Russian targets as part of a $US700 million ($A975 million) weapons package.
The United States is providing Ukraine with high-mobility artillery rocket systems that can accurately hit targets as far away as 70 kilometres after Ukraine gave "assurances" they would not use the missiles to strike inside Russia, senior administration officials say.
In a New York Times op-ed published Tuesday, Biden says Russia's invasion of Ukraine will end through diplomacy but the United States must provide significant weapons and ammunition to give Ukraine the highest leverage at the negotiating table.
"That's why I've decided that we will provide the Ukrainians with more advanced rocket systems and munitions that will enable them to more precisely strike key targets on the battlefield in Ukraine," Biden says.
The latest assistance package, expected to be unveiled on Wednesday, will include the M142 High Mobility Artillery Rocket System to counter Russian missile attacks, a senior Biden administration official says.
It also includes ammunition, counter-fire radars, a number of air surveillance radars, additional Javelin anti-tank missiles, as well as anti-armour weapons.
Ukrainian officials have been asking allies for longer-range missile systems that can fire a barrage of rockets hundreds of kilometres away, in the hopes of turning the tide in the three-month-long war.
Biden on Tuesday told reporters that "we're not going to send to Ukraine rocket systems that strike into Russia".
He did not rule out providing any specific weapons system, but instead appeared to be placing conditions on how they could be used. Biden wants to help Ukraine defend itself but has been opposed to providing weapons that Ukraine could use to attack Russia.
Thousands of people have been killed in Ukraine and millions more displaced since the Russian invasion on February 24, which Moscow calls a "special military operation" to "denazify" its neighbour. Ukraine and its Western allies call this a baseless pretext for a war to seize territory.
The West has been increasingly willing to give Ukraine longer-range weaponry, including M777 howitzers, as its force battle Russians with more success than intelligence officials had predicted.
But US intelligence has also warned about growing risks, particularly given a mismatch between Russian President Vladimir Putin's apparent ambitions and the performance of his military.