What concerns have been raised about US-Russia diplomatic talks in Riyadh?

The diplomatic talks in Riyadh have raised serious concerns that the US may be making concessions to Russia without securing anything in return. According to Alex Marquardt, Chief National Security Correspondent, these discussions may represent a pivotal moment where Russia is being welcomed back into international diplomacy and 'recognized again by the West' after being isolated. This diplomatic shift occurs amid controversial statements from the American president regarding Ukraine, which further amplifies concerns about the US potentially undermining its support for Ukraine while Russia regains influence on the global stage.