They do, but NATO heads of state seem to forgot that Turkey exists, and is an extremely strong military power, which can put can on top of any Russian activity in their vicinity within days.
Turkey is a sui generis NATO ally. The US "claimed it" to get the straits, effectively providing a nuclear arsenal as payment, but it's become very clear that the country's priorities have always been somewhat unique and shifted considerably since the Cyprus conflict - even more so since Erdogan's purges.
Turkey would definitely be a NATO ally in an all-out war (which would be the end of humankind, so whatever), but they will probably never engage Russia directly in a limited fashion while Putin and Erdogan are in power.