President Joe Biden's administration will allow Ukraine to use U.S.-provided weapons to strike deep into Russian territory, three sources told Reuters.
What happened, is American aide to Ukraine is about to end in January, due to the Trump administration taking over.
Plus, aide was likely waiting until the end of the American election system in hopes Democrats won, so less for the Republican side to complain about.
I think the issue has been that Russia has stated that the US not having limits on the use of their supplied weapons would be seen as a US escalation of the war. And that becomes tricky because Ukraine is not a NATO country, but Russia drawing the US into the war would bring are NATO allies in as well potentially allowing WW3 (although for Trump it would be only WW2).