What significant diplomatic event occurred between the United States and Russia regarding Ukraine?

American and Russian officials concluded crucial talks in Saudi Arabia over Ukraine's future, marking an unprecedented diplomatic gathering. The discussions took place in Riyadh without Ukraine's participation, less than a month into Trump's presidency. This historic meeting left European allies observing nervously from the sidelines as the two powers engaged in direct negotiations about Ukraine's fate. The exclusion of Ukraine from these talks about its own future represents a significant shift in diplomatic approach to the ongoing conflict.