[Right_Wing_Madman]

According to the leaked Pentagon documents, the target date for Ukraine's counteroffensive was April 15th, but they don't want to do it (not enough troops, equipment, ammo). Ukraine prefers to remain on the defense, which is probably their best chance for national survival.

[Williams]

There was no way they could attack on April 15 with mechanized divisions, the terrain being mud.
It will happen soon enough.