taking it out, as he often does, on ukraine, possibly harassing ukrainian commercial shipping. i think putin s next move is to take full control of the strait and to exert dominance in the sea. he wants to effectively blockade or economically starve ukraine. reporter: one of the dangers ahead in the high-stakes game of military maneuvers, analysts worry about miscommunication between u.s. and russian forces on land, sea or air and a possible miscalculation. ships or planes may come too close to each other, someone firing and then you have a full-scale escalation. that is what everyone is watching tonight. that s a good point. you have new signs russia is building up its military in occupied crimea. reporter: new and disturbing signs. new satellite photos showing russia installed an s-400 missile battery in occupied c cry cry miya. necessary are some of russia s
[ applause ] those are the members of the new hope mass choir along with the new jersey mass choir performing who s song was that? grateful . that s a beautiful song. we ve been told that oprah winfrey and gayle king have arrived inside the church as our coverage of the special day, remarkable day. it s interesting because outside today is such a beautiful, beautiful day. it is. it looks so joyful inside the church but you have to imagine for everyone there their hearts are breaking. 48 years old is so young. well, broken hearts do not undermine the capacity to praise god. we live in this dynamic of not having what we want, but needing to be grateful for what we have. and all of us are grateful for the great joy of having known and had whitney houston in our presence. that s what this celebration is about. and you can tell that from all the tweets that are pouring in now to the #whitney houston. people are feeling really uplifting by