The casualty toll in the Russia - Ukraine war is the highest in a European conflict since WW2. Around half a million died in the Syrian civil war, 300,000 in Yemen, China has fought India, there is war in Sudan and many places in Africa, much of it Islamists against the rest. We've also seen Afghanistan, Israel v Arabs states and Iran, not to mention Ethiopia.
China has promised to invade Taiwan. The only thing that moderates China's aggression is its need for Western markets to sell its goods to. I doubt that moderation extends to Taiwan.
Nations have fought other nations since forever. What Lord Jesus said was fascinating, because Rome ruled much of Europe with an iron fist for about 200 years. Dissent was not tolerated, as Israel found out when it rebelled against Rome. Very few nations dared take on Rome until about 180 AD. Then the Roman empire began to collapse. The end came in AD192 with a civil war in the Roman empire.
My concern is the war between Islam and the rest of the world. The Muslim invasion of Europe has been peaceful, unlike the campaigns of the 8th century. There is something like 30 million Muslims in Europe. That's 30 million potential Jihadists. As a Muslim woman said to someone I met, they had better learn Arabic, for when Islam takes over.