My opinion is Ukraine and EU can kick Russia’s ass as long as they ramp up military production. Ukraine’s army tech went from 20+ years old soviet Kalashnikov stockpiles leftovers to domestically produced drones which dominate battlefield. They can and will increase production. The real question is US reckless enough to ease sanctions on Russia or worse start selling military/dual purpose goods. While Ukraine can withstand demoralized and economically crippled Russia. Ukraine will definitely lose if things get somewhat better for Russian economy and politics. What is more scary is what will happen with US-EU relationships. That would literally be US-EU proxy war.