EU leaders gather in Brussels Thursday for a make-or-break summit on using frozen Russian assets for Ukraine with key player Belgium under pressure to drop its opposition.The 27-nation bloc is scrambling to strengthen Kyiv's hand as Russia's war drags towards the four-year mark and US President Donald Trump pushes for a quick deal to end the fighting.Officials have insisted the talks will last as long as it takes to hammer out an agreement, saying both Ukraine's survival and Europe's credibility are at stake.