Ukrainian officials on Thursday said Kyiv needs more weapons as its war with Russia ensues for a fifth week, arguing it has shouldered the burden as the defender of “the values of a democratic world.”

American troops have been training Ukrainian forces to effectively use weaponry like Javelins, stingers, and grenade launchers, and the U.S. has pledged more than $2.5 billion in security assistance and humanitarian aid.

But Ukraine continues to push the U.S. and NATO for more as security officials warn Russia is re-evaluating its strategy in the war-torn nation.