President Volodymyr Zelensky of Ukraine is expected to travel to Berlin on Wednesday in his first visit to Germany since Chancellor Friedrich Merz took office earlier this month.

The visit comes at a crucial moment in the German-Ukrainian relationship.

With doubts looming about the future of America’s commitment to Kyiv, Mr. Merz has stepped forward as a leading figure in the European alliance supporting Ukraine. That has meant eschewing the cautious stance of his predecessor, Olaf Scholz, even as he faces opposition from within his governing coalition on expanding German military support.

After Russia invaded Ukraine in February 2022, it took over a year for Mr. Scholz to invite Mr. Zelensky to Berlin. Though the Ukrainian leader has not been to Berlin since October, the one-day visit will be his third meeting with Mr. Merz since the chancellor took office on May 6.

What are the leaders likely to discuss?

A major topic of conversation will likely be military aid in general and, specifically, the Taurus cruise missile, a system jointly developed by Germany and Sweden.

The large size, advanced navigation system and 310-mile range of the Taurus means it can accurately deliver bigger strikes deeper into Russian territory than other missiles in Ukraine’s arsenal.

The Taurus has long been at the top of Mr. Zelensky’s wish list. Though Britain and France already provide Ukraine with their jointly developed SCALP/Storm Shadow cruise missile, the Taurus would be able to strike as far as bridges connecting the Crimean Peninsula to mainland Russia.