His Holiness the Dalai Lama spoke on "Universal Responsibility & the Inner Environment" at the University of Portland in Portland, Oregon, USA on May 9, 2013. He actually addressed the issue of extraterrestrial in the first 2 minute video which is rather interesting. If you wish to see the entire talk than check out the second video below.
Dali Lama Talking about ET
The Dali Lama's Full Speech