Administration officials say security and humanitarian constraints are concerns for the leaders, with as many 5,000 migrants reaching Europe each day over the so-called Balkan migrant route.
The vice president will also meet with European Council President Donald Tusk to discuss the migration crisis, the fight against terrorism, the Russia-Ukraine conflict, energy and trade.
Biden will also attend bilateral meetings with Croatian and other leaders to discuss the response to the refugee crisis, energy and economic ties.
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