What concerns have been raised by the talks between American and Russian officials in Saudi Arabia regarding Ukraine?

The talks between American and Russian officials in Riyadh, Saudi Arabia have raised significant concerns about Ukraine's future and European security interests. The critical aspect of these discussions is that they occurred without Ukrainian representation, heightening anxieties among European allies. This unprecedented meeting signals growing geopolitical tensions, particularly regarding Russia's demands about NATO membership. European leaders are expressing alarm that these negotiations could lead to a hasty deal under President Trump's administration that might sacrifice crucial European security considerations, prompting calls for increased military spending and stronger collaboration with the United States.