chief of the faa i asked him why do these near misses seem to be happening so often. and the bakery helping young chefs rise to their full potential and inspiring america. announcer: this is nbc nightly news with lester holt good evening, and thank you for joining us we ll get to that major weather news in a few moments. but first, we want to bring you the latest in what we know about a dangerous aerial encounter in the sky today between the united states and russia the pentagon saying a russian fighter jet poured fuel on an unmanned american drone, then collided with it over the black sea. it sent the american aircraft into the water the confrontation escalating already high tensions between the countries which are telling different versions of today s event. courtney kube has the latest for us from the pentagon. reporter: the stunning showdown happening over the black sea near ukraine and russia when an unmanned american drone like this one called a reaper was c
ba back now with our series one nation overdosed, an alarming look at the rise of the newest drug wreaking havoc in a major u.s. city. dasha burns reports, and we do want to caution you. some of the images in the story are disturbing reporter: the kensington neighborhood of philadelphia for decades has been an epicenter of the nation s drug crisis, according to the department of justice. this is the infamous kni. reporter: but the supply in the largest open-air market on the eastern seaboard has become even more dangerous, evolving from heroin to the more potent fentanyl, and now those drugs laced with xylazine, referred to as tranq the city is rolling out wound treatment vans to combat the drug, believed to prolong the effects of fentanyl, it also causes deep wound infects r: th is rolling out wound tonight user s body, eroding