 A very powerful message, I think, for all of us to contemplate. And it does raise this question that you were wrestling with in your answer before. What then is our obligation to the people of Ukraine? So first, this is the worst refugee crisis a country has faced since the Second World War. Syria, Yemen, other countries in the Middle East and North Africa have also endured horrific internal civil wars and displacement. But 10 percent of the population of Ukraine has fled in just a few weeks. And overwhelmingly, the refugees of Ukraine are women and children. First, we have a profound moral obligation to come to their aid and to provide financial support, you know, food and temporary shelter, and other assistance to the 4.7 million Ukrainians who've already left their country and the 7 million or more who are already displaced within Ukraine. First, second, I think we have an obligation to provide every possible weapon system to the Ukrainian defenders. The challenge there is how far do we go up the technology scale and what is militarily useful? We've had genuine debates about whether the MiG-29s that or advanced Soviet-era jet fighters that the Ukrainians are asking for would actually be militarily all that useful. It is clear that advanced missile defense systems like the S-300 are incredibly useful and advanced armor and artillery, which we are now beginning to provide. Our NATO allies, the Czechs, the Slobaks and others are beginning to provide legacy Soviet systems for air defense and armored vehicles. But, you know, to get back to the core issue, at some point, we are going to have to confront the reality that Putin may be willing to escalate beyond our willing to take risks. And if we allow Ukraine to become the Syria of Eastern Europe, I think we will have failed both the Ukrainian people and this moment in history. There are complex reasons why we did not get engaged more actively and aggressively in Syria. I would have supported our doing so, but I recognize that the opposition in Syria was a far more complicated mix of players and partners and that the region was far more divided. This is a different fact matter where the Ukrainian people are almost completely united in their opposition to Russia. The entire West is allied and organized in a way they haven't been in decades. Heck, even the Swiss have imposed banking sanctions and even the Swedes who sat out the Second World War have sent material aid. In fact, Vladimir Putin's violence and aggression, his barbarism towards the Ukrainian people may have finally expanded NATO by having Finland and Sweden seek admission, something they've considered for years but have never actually sought. So our obligation to the Ukrainian people is that their sacrifice be worth it. What is happening here is being watched by other autocrats around the world from the DPRK in Iran to obviously the PRC and Xi Jinping's leadership of the Chinese Communist Party. I think the future of the 21st century is going to be written in the next few weeks or months in how fiercely we are willing to defend freedom in Ukraine.