you and two buddies are an intelligence gathering unit for the CIA in Ukraine. your particular task has been completed and the CIA wants you all to return to CONUS in 1 month for other duties. they don't care what you do in the meantime as long as you don't get caught.
all three of you are in a bar in Kiev wondering what to do for a month.
between the three of you, you know many SF and intelligence operators from several countries, Ukranian commando units that have been trained for years by US SF, and contacts in the highest levels of the Ukrainian government willing to supply money and material with no questions asked.
the Kremlin is a building complex on 68 acres just north of the Moscow River, 320 miles from the Ukranian border.
how would you blow up the Kremlin?