KYIV, Ukraine — Ukrainian President Volodymyr Zelenskyy declared Tuesday that Russia has not “broken Ukrainians” nor triumphed in its war, four years after an invasion that has severely tested the resolve of Kyiv and its allies and fueled European fears about the scale of Moscow’s ambitions. In a show of support, more than a dozen senior European officials headed to the Ukrainian capital to mark the grim anniversary of the conflict, which has killed tens of thousands of people, upended life for millions of Ukrainians, and created instability far beyond its borders. Zelenskyy said his country has withstood the onslaught by Russia’s bigger and better equipped army, which over the past year of fighting captured just 0.79 percent of Ukraine’s territory , according to the Institute for the Study of War, a Washington-based think tank. Russia now holds nearly 20 percent of Ukraine. “Looking back at the beginning of the invasion and reflecting on today, we have every right to say: We have defended our independence, we have not lost our statehood,” Zelenskyy said on social media,