Trump wants to send the Brazilian Army to ensure peace in Ukraine and prevent Putin from attacking again.
According to The Economist, after the ceasefire and the end of hostilities, the U.S. is leaning toward proposing a Brazilian and Chinese peacekeeping force for Ukraine.
Brazil has extensive experience in participating in and leading peacekeeping missions, notably in Haiti, and officially has no clear geopolitical interests in the region, which would ensure a degree of neutrality.