PBK-500U Drel

{{Short description|Russian guided cluster glide bomb}}

{{Infobox weapon

| name = PBK-500U Drel

| image = File:MAKS2015part7-47.jpg

| image_size =

| alt =

| caption = PBK-500U SPBE-K cluster bomb and ODAB-500PMV bomb

| type = Glide bomb

| origin = Russian Federation

| is_ranged = Yes

| is_bladed =

| is_explosive = Yes

| is_artillery =

| is_vehicle = Yes

| is_missile = Yes

| is_UK =

| service = 2024–present

| used_by = See Users

| wars =

| designer = NPO Bazalt

| design_date = 2016

| manufacturer = NPO Bazalt

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| production_date = 2024 (planned)

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| variants = See Variants

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| weight = 540 kg

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| range = 30–50 km

| max_range = Up to 50 km

| feed =

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| guidance = Inertial guidance/GLONASS

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| altitude = 14 km

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| launch_platform = Aircraft

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}}

The PBK-500U Drel (Russian: Дрель, {{lit}} "drill") is an inertial and GLONASS-guided cluster glide bomb developed by the Russian Federation, designed to destroy enemy armored vehicles and buildings. Drel is equipped with friend or foe identification system and electronic countermeasures making it resistant to jamming and radar detection and is being introduced to the Russian military in 2024.{{Cite web|url=https://www.janes.com/defence-news|title=Janes | Latest defence and security news|website=Janes.com}}{{Cite web|url=http://www.deagel.com/Defensive-Weapons/PBK-500U_a003494001.aspx|title=Ancile|website=www.deagel.com}}{{Cite web|url=https://www.express.co.uk/news/world/901928/russia-army-bomb-putin-stealth-drel-moscow-techmash|title=Russia to unleash new UNDETECTABLE stealth bomb designed to GLIDE across enemy airspace|first=Chloe|last=Kerr|date=January 8, 2018|website=Express.co.uk}}{{Cite web|url=https://www.ainonline.com/aviation-news/defense/2006-12-06/russian-bomb-builder-shows-its-target-smarts|title=Russian bomb builder shows off its target smarts|first=Vladimir|last=Karnozov|website=Aviation International News}}{{cite web | last=Epstein | first=Jake | title=Russian glide bombs have been a huge headache for Ukraine, and Moscow says it's making new ones | website=Business Insider | date=2024-01-10 | url=https://www.businessinsider.com/russian-glide-bombs-headache-ukraine-moscow-making-new-ones-2024-1 | access-date=2024-01-16}} Bazalt considers equipping Drel with a pulsejet engine to increase its range.