Ukraine War: The Second Anniversary

The war in Ukraine is arriving on its second anniversary. After two years, the conflict is at an apparent stalemate, while further US aid is in limbo at Congress. What has been the course of the war up until this point? Why did Ukraine's counterattack fail? What are the prospects for the future? Will Ukraine collapse, or will it outlast the Russian invasion? How many main battle tanks does Russia have left? What is the situation with artillery ammunition?  Questions for the upcoming months.