That church is 25 years old (it was completely destroyed in WW2, the new one was finished in 2000 and much of the interior work is still not done).
It has already been looted and robbed by the Ukrainian government - as in, they literally stole icons and other objects - and the church itself was stolen from the Orthodox Church of Ukraine and transferred to their government pseudo-church. They threw priests and monks from the Lavra in prison.
The damage from the fire is very minor (as we can see from today's daytime photos), which is consistent with a shot-down drone crashing into it or Patriot AD having a bad day, but it *is* weird that they had photographers on standby when normally Ukrainian citizens are hit with 10 year prison sentences on treason charges for filming the results of Russian air strikes. Who knows.
BREAKING:
A Russian drone has struck the Kyiv Pechersk Lavra.
Built in 1051, the monastery is the most important site of Orthodox Christianity in Ukraine.