Why was it difficult to achieve peace negotiations in the Ukraine-Russia conflict before Trump's administration?

According to Dr. Sergei Markov, former Putin adviser, peace negotiations were impossible because the United States and Western countries blocked diplomatic efforts after overthrowing Ukraine's democratically elected president in 2014. He claims these nations were the main aggressors who imposed an illegal regime on Ukrainian people and initiated war against Russia on Ukrainian territory. Markov's perspective suggests that Western powers deliberately obstructed peace initiatives, making diplomatic resolution unattainable until Donald Trump came to power. This represents the Russian viewpoint on why previous diplomatic channels failed.