evidence: KURSK, Russia—More than six weeks into Kyiv’s military incursion into the Kursk region of Russia, Ukrainian soldiers are still delighting in the triangle of white tape fixed to the hundreds of vehicles crossing the border into Russian territory. [...] There was no sign of Ukrainian withdrawal, or preparation for a withdrawal, as we traveled. Most of the traffic marked with white triangles was heading in one direction, right across that border into Russian territory. Kyiv hopes that its military gambit in the region will help it turn the tide in the war, which has been marked more by drone-haunted trench warfare than blitzkriegs. [...] But some of the other strategic goals have been less successful. Zelensky was hoping that this operation would also expedite the decision to allow Ukraine to strike deep into Russian territory using Western-supplied cruise missiles. While the White House has refused to change its position on this, Ukraine’s growing domestic long-range capabilities have been causing increasing damage to Russia’s back line in recent weeks, further embarrassing the Kremlin.