Putin will not stop at Ukraine. His victory would be a loss for Europe, bringing war closer to its borders. For America, it would mean the end of a world order based on law — replaced by global injustice, where dictators act with impunity. If Putin is not stopped now, he will return with an even larger army — not just to destroy Ukraine, but to threaten all democratic nations. We can prevent this and ensure lasting security through stronger sanctions, total isolation of Russia, increased military support and solid long-term security guarantees for Ukraine. Anything less will only embolden him to wage more wars.