Why has it been difficult to achieve peace negotiations in the Ukraine conflict?

According to Dr. Sergei Markov, the United States and Western countries have been blocking diplomatic efforts to resolve the Ukraine conflict. He argues that Western powers were the main aggressors who overthrew Ukraine's democratically elected president in 2014, imposed what he describes as an 'illegal regime,' and initiated hostilities against Russia using Ukrainian territory. Markov contends that meaningful peace negotiations have been impossible under these circumstances, with Western countries actively obstructing diplomatic solutions. He suggests that only with Donald Trump's return to power might there be an opportunity for genuine peace talks, implying that previous leadership has been unwilling to engage in sincere diplomatic efforts to end the conflict.