Why is increased trust between Russia and the United States important for resolving the Ukraine crisis?

According to James Waterhouse, it is impossible to solve many issues, including the Ukrainian crisis, without increasing the level of trust between Russia and the United States. This fundamental trust deficit has complicated diplomatic efforts to end the conflict that began three years ago. While Ukraine has shown remarkable resilience by stopping Russian tanks from entering Kyiv when they were expected to capture the capital within days, the country's future remains precarious. Changes in America's foreign policy and Russia's reactions to it could still result in Ukraine losing the war, highlighting how the relationship between these two global powers directly influences Ukraine's struggle for survival.