The Russians had Irpin. There were even videos of refugees escaping over the blown bridges at Irpin, and the Russians advanced past those obstacles and spent a lot of time putting pontoon bridges over the river. At one point the Russians were well past Irpin, all the way to the Kiev zoo.
But the Ukes are way, way past Irpin, to the major crossroads at Ivankiv, as of yesterday. The Russians seem to have retreated past that.
Nobody claimed Irpin even if the troops passed it. Ukraine subjected the area to horrific bombardment from Kiev. It makes no sense to stay there as the place is a kill zone. The original Kiev pincer was to tie the Kiev garrison and the movement of the Ukrainian forces from the West. It allowed the Crimean and DNR forces to take hold of southeast. And take some 90,000 best Ukrainian forces into pincer in Donbas. Now the Kievan group is moving to help them finish the pincer.