WASHINGTON -- Ukrainian President Volodymyr Zelenskyy arrived in Washington on July 28 at what may be one of the most consequential moments in US-Ukraine relations since Donald Trump's return to the White House as Kyiv looks to build support among lawmakers.Officially, the visit is centered on the July 28 funeral of the late Senator Lindsey Graham, one of Ukraine's staunchest supporters in Congress. But the political significance extends far beyond the memorial service.Zelenskyy is scheduled to meet Trump and then congressional leaders later in the day as the US Senate prepares to advance a bipartisan sanctions package targeting Russia's energy revenues -- legislation championed by Graham before his sudden death.The convergence of high-level diplomacy, congressional action, and shifting political dynamics inside Trump's Republican coalition gives Kyiv an opportunity to strengthen its position in Washington amid growing indications that the Trump administration is recalibrating its approach to Russia's war against Ukraine.Following a cordial meeting between Trump and Zelenskyy at the recent NATO summit in Ankara -- a stark contrast to their contentious White House encounter in February last year -- the administration has appeared increasingly receptive to Kyiv's arguments.