US President Joe Biden has announced more than $8 billion in military assistance for Ukraine to help the country "win this war" against Russia, using a visit by President Volodymyr Zelensky to make a major commitment.
The aid includes the first shipment of a precision-guided glide bomb called the Joint Standoff Weapon, with a range of up to 130km.
The medium-range missile gives Ukraine a major upgrade to the weapons it is using to strike Russian forces, allowing the Ukrainians to do it at safer distances.
The bomb, capable of striking targets with high accuracy, is to be dropped from fighter jets.
Mr Biden will not announce that Washington would let Ukraine use US missiles to hit targets deeper in Russia, a US official said.
Supporting Ukraine, which Russia invaded in February 2022,has been a US top priority, Mr Biden said in a statement.
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"That is why, today, I am announcing a surge in security assistance for Ukraine and a series of additional actions to help Ukraine win this war," said Mr Biden, who leaves office in January.
The bulk of the new aid, $5.5bn, is to be allocated before Monday's end of the US fiscal year, when the funding authority is set to expire.
Another $2.4bn is under the Ukraine Security Assistance Initiative, which allows the administration to buy weapons for Ukraine from companies rather than pull them from US stocks.
This will provide Ukraine with additional air defence, unmanned aerial systems and air-to-ground munitions, as well as strengthen Ukraine's defence industrial base and support its maintenance and sustainment requirements, Mr Biden said.
Under his plan, the president said, the US Defense Department will refurbish and provide Ukraine with an additional Patriot air defence battery and more Patriot missiles.
Mr Biden ordered the Pentagon to expand training for Ukrainian F-16 pilots, including by supporting the training of an additional 18 pilots next year.
To combat Russian sanctions evasion and money laundering, the US will act to disrupt what Mr Biden called "a global cryptocurrency network, in coordination with international partners."
Mr Biden said he will convene a leader-level meeting of the Ukraine Defence Contact Group in Germany next month to coordinate efforts of more than 50 countries supporting Ukraine.
Before meeting Mr Biden at the White House later, Mr Zelensky is due to meet Democratic and Republican leaders at the Capitol.
Ukraine's defence has largely received bipartisan support in the US, but it was not clear how many Republicans would make time to sit down with Mr Zelensky amid rising criticism of his government from party leaders, including Donald Trump, the Republican presidential candidate.
Mr Trump has been criticising the Ukrainian president as he campaigns for the 5 November election and, at least for now, turned down a request from Mr Zelensky for a meeting.
The former president was sharply critical of Mr Zelensky yesterday, telling a campaign rally in North Carolina, "We continue to give billions of dollars to a man who refused to make a deal, Zelensky."
Mr Trump also blamed President Biden and Vice President Kamala Harris, his Democratic presidential opponent, for allowing Russia's invasion.
Many congressional Republicans have been furious about Mr Zelensky's visit on Sunday to a munitions factory in Scranton, Pennsylvania, where Mr Biden grew up.
The Republican-led House of Representatives Oversight Committee opened an investigation into the trip.
House Speaker Mike Johnson, a Republican who is not expected to meet Mr Zelensky demanded that he fire his ambassador to Washington for planning the Scranton trip, although he told reporters this demand was not a threat to oppose military aid.
Kremlin says changes to Russia's nuclear policy are a signal to the West
Meanwhile, the Kremlin said that changes to Russia's nuclear weapons doctrine outlined by President Vladimir Putin should be considered a signal to Western countries that there will be consequences if they participate in attacks on Russia.
Mr Putin said that Russia could use nuclear weapons if it was struck with conventional missiles, and that Moscow would consider any assault on it supported by a nuclear power to be a joint attack.
The decision to change Russia's official nuclear doctrine is the Kremlin's answer to deliberations in the United States and Britain about whether or not to give Ukraine permission to fire conventional Western missiles into Russia.
Kremlin spokesman Dmitry Peskov said adjustments to a document called "The Foundations of State Policy in the Sphere of Nuclear Deterrence" had been formulated.
Asked by reporters if the changes were a signal to the West, Mr Peskov said: "This should be considered a definite signal."
"This is a signal that warns these countries about the consequences if they participate in an attack on our country by various means, and not necessarily nuclear ones," Mr Peskov said.
The world, Mr Peskov said, was witness to an "unprecedented confrontation" which he said was provoked by the "direct involvement of Western countries, including nuclear powers" in the Ukraine war.
