The United States last month committed to accepting as many as 100,000 Ukrainian refugees, but it has yet to establish a way for them to arrive directly. There are no resettlement programs or visa pipelines. That has left Ukrainians in growing numbers to book flights to Mexico. They arrive at the U.S. border on foot, many pushing kids in strollers and dragging suitcases behind them.

On social media platforms and messaging apps, groups with thousands of members now explain the process in the Ukrainian language: From major European cities, fly to either Cancún or Mexico City. Ukrainians don’t need visas to enter the country. From there, take another flight to Tijuana.

A small encampment has sprouted about 1,000 feet from the U.S. border, where families are sleeping in tents and under tarps. It is the same tiny patch that has hosted refugees from around the world in recent years: Central Americans who were part of the caravans in 2018; Haitians and Cubans who arrived during the pandemic; Mexicans who fled a surge in violence this year.