What significant diplomatic development occurred between the US and Russia regarding the Ukraine war?

Secretary of State Marco Rubio and Russian Foreign Minister Sergei Lavrov held their first high-level meeting in nearly three years, discussing the Ukraine war without Ukrainian representation present. This diplomatic engagement was described as "the first step of a long and difficult journey, but an important one." Concurrently, President Trump claimed he has the power to end the conflict, controversially blaming Ukraine for Russia's invasion and stating "I think it's going very well." This diplomatic shift has sparked concerns in Europe about the implications of this new US-Russia dialogue while Russian attacks on Ukrainian cities continue.