Your assumption is based on the idea that the end of the 70th week immediately ushers in the Millennial Kingdom. It may not be that way.
Well the end of teh 70th week does not immediately end with the millenial kingdom.
when Jesus returns, He defeats the forces of Antichrist that were marshalled at Armagedón, fights the Ac back to Jerusalem, kills him and asdcends the mount of olives.
Then He sits on his throne, gather the nations (peoples) and judges. those who helped the Jews (the saved of the trib) go into the kingdom, the rest into hell.
There is also the cleansing of the temple and the mourning Israel does, so the millenial kingdom occurs approx. 90 days after Jesus returns according to all the scriptures that pertain.
But once again the fact that Israel gathers and burn the weapons of war for fuel for 7 years and halfway through th etrib, they flee the land for their lived to the area of Petra, shows that the Russian invasion occurs no later than 3 1/2 years BEFORE the trib commences.
Remember for the last half of teh trib, Israel has fled and is provded for by god (Rev. 12) and will not be gathering teh weapons during that time, so all of the Ezekiel 38-40 prophewcy must end by the mid point of the trib.