Can I report my international graduate tuition if the school does not supply a 1098-T?

Possibly.

Ask the school if they qualify. If they do you can select an exception to the 1098-T

According to the IRS:

“Eligible educational institution. An eligible educational institution is any college, university, vocational school, or other postsecondary educational institution eligible to participate in a student aid program administered by the U.S. Department of Education. Virtually all accredited public, nonprofit, and proprietary (privately owned profit-making) postsecondary institutions meet this definition. An eligible educational institution also includes certain educational institutions located outside the United States that are eligible to participate in a student aid program administered by the U.S. Department of Education. The educational institution should be able to tell you if it is an eligible educational institution.”

“If a student's educational institution isn't required to provide Form 1098-T to the student, you may claim a credit without Form 1098-T if you otherwise qualify, can demonstrate that you (or a dependent) were enrolled at an eligible educational institution, and can substantiate the payment of qualified tuition and related expenses.”