Ukraine is benefiting from President Donald Trump’s recent frustration with Russian President Vladimir Putin, but Trump’s first six months in office show that no one knows if it will last.

Trump has prioritized trying to find a diplomatic resolution to the war, which has cost the lives of hundreds of thousands of Russians and Ukrainians over the nearly 3 1/2 years since Russia’s full-scale invasion, but through almost six months, his administration’s efforts have made little headway.