Kremlin has already spent over $200 billion, according to Washington. At least 315,000 Russian soldiers have been killed or wounded in the fighting in Ukraine.
Arms deals lost as a result of the war have so far cost Russia ten billion dollars. In terms of lost potential economic growth, the war could even cost Russia $1.3 trillion if one extrapolates how the Russian economy could have grown from the start of the War to 2026. Ukraine is defending itself as best it can and is dependent on arms and financial aid from European states, the USA and other democratic countries.