https://www.realclearpolitics.com/articles/2022/05/01/why_america_changed_its_war_aims_in_ukraine_147543.html
Slowly, slowly, the United States has expanded its war aims in Ukraine and significantly altered its pipeline of military supplies. Those two changes are mutually reinforcing. The U.S. is finally sending Ukraine the heavy weapons it needs because the Biden administration has finally decided it actually wants Ukraine to win and the Russian army to suffer losses so drastic it will not threaten other Western countries.
Highlighting these changes is not meant to downplay the support America has already given Ukraine. Biden’s team has done a lot. Not nearly as much as Volodymyr Zelenskyy wanted, but a lot. Biden and his administration forged a coalition of NATO partners, provided Ukraine real-time intelligence about Russian forces, and shipped huge quantities of light weapons and ammunition. Those supplies were critical in protecting Kyiv.
Still, the U.S. and its NATO partners could have done much more. They did too little to deter an invasion when they could have prepared for it by training and equipping Ukrainian forces on NATO-standard equipment. As the invasion loomed, they delayed sending military equipment because the CIA predicted that Russia would win quickly and capture those supplies. After Ukraine fended off the Russian attack on Kyiv, the U.S. rejected Zelenskyy’s urgent requests for heavy weapons, including artillery, long-range drones, cruise missiles, planes, and anti-aircraft batteries. (It is still wisely refusing to insert Western troops and airpower into combat, fearing that could provoke a wider conflict with Russia.) Nor had the U.S. endorsed Ukraine’s principal war aim: to defeat Russia and recover as much territory as possible. All that changed over the past week. Secretary of Defense Lloyd Austin went even further. In a dramatic announcement, he said the U.S. wanted to weaken Russia.