U.S. President Joe Biden has pledged to send Ukraine more advanced rocket systems and munitions to more precisely strike key targets on the battlefield. The White House had been hesitant to send the weapons, which have long been requested by Kyiv.
The Biden administration will send the systems as part of a new $700 million military aid package for Ukraine.
Ukrainian President Volodymyr Zelenskyy has described Russian bombing in the front-line eastern city of Sievierodonetsk as "insanity" given the presence of a large-scale chemical plant.
Residents of Sievierodonetsk have been warned not to leave bomb shelters due to the risk posed by toxic fumes.