"The 2,750 tons of ammonium nitrate that exploded are believed to have come from a Russian-owned vessel that stopped in Beirut while it was sailing in 2013 from Georgia to Mozambique. The ship was abandoned, and the cargo is believed to have been offloaded to the port’s warehouses, the site of the explosion on Tuesday."
https://www.msn.com/en-us/news/world/what-caused-the-beirut-explosion-what-we-know/ar-BB17AfC1?li=BBnb7Kz
There - so Russia is at least partly to blame.