"...Nothing stopping Putin from ending his war today...."
Unsubstantiated, simple-minded statement, that fails to consider all the complexities of global economics, finance and geopolitics.
"...He started his war without negotiating with Ukraine..." Unsubstantiated, false statement. Russia and Ukraine maintained lines of communication, before the war and up to a moment that the Ukrainian government unilaterally decided to ban itself from negotiating with the Russian government.
"...he can just as easily end his war without negotiating with Ukraine..." False statement.
