Ukraine?
you mean the eastern part, where they get to supply their naval base in the Crimea with a roads system suited for large trucks of supplies,
which has voted for Moscow rather than the guys running western-Ukraine?
that naval base is over 100 years old,
and the Turks hold the canal leading to the med.
now they got their first naval base in Syria.
don't drive countries / regions the size of Russia and/or China and/or Japan and/or Asia, or other large regions,
into a corner.
or you'll find your many military bases (1200+ by now, right?) suddenly and quickly useless by better equipment used in those battles,
like happened to so many large armies with large sets of troops and arms ready to go,
when their opponents were ready to team up on them,
and timed their attack to be able to bring sufficient superior force(s).
you should be taught more than Hollywood teaches you about the major wars of the past.
even including the series and movies made by Hollywood since around 1980.