They said they needed 1000 howitzers earlier in the week, and 500 MLRS, 500 tanks and various other things to push the Russians back.
That is approaching the number of howitzers and MRLS that the US has in its arsenal, total; to then say that they won't negotiate until the Russians are pushed out is to say they are not going to negotiate.
That is their choice, but doing that harms them, their people, the West, Russia and the rest of the world and increases the risk of an absolute global horror taking place (nuclear conflict, mass starvation, mass disorder, even further damage to the climate or a mix of those).
They should have been in constant, in depth and comprehensive talks since the invasion started - yes, the Russians are going to mess about (as everyone does in war negotiations when they think they are winning) but the world needs to either see peace or to see Ukraine exhaust every effort diplomatically so that the impact of a prolonged war on everyone else can be justified.