How
might allies respond if Russia invades Ukraine?
By Hans Binnendijk and Barry Pavel
Dec 7, 03:45 PM
Ukrainian servicemen take part in the joint Rapid Trident military exercises with the United States and other NATO countries nor far from Lviv on September 24, 2021, as tensions with Russia remain high over the Kremlin-backed insurgency in the country's east. (Photo by YURIY DYACHYSHYN/AFP via Getty Images)
NATO
needs to plan beyond efforts to deter another Russian invasion of Ukraine and
recognize that its actual response may differ depending on the extent of
Russian military operations.
Alliance
foreign ministers met recently in Riga to consider how they should deal with
Russia’s troop buildup near Ukraine and how to deter a repeat of the 2014
Russian occupation and annexation of Crimea, or worse. After the meeting,
Secretary of State Antony Blinken told the press that NATO was united and would
respond with a range of high-impact economic sanctions, as well as additional
efforts to reinforce alliance defenses on the eastern flank.
In
2014, Putin was not deterred by economic sanctions. Should deterrence fail again, much of the actual
American response may depend on where and how much of Ukraine Putin attempts
to occupy.
Before
acting, Putin will need to remember that the United States has a long history
of reacting more forcefully to a major military provocation than its
adversaries had expected. The Korean War and Desert Storm are just two
prominent examples.
One
might conceive of four broad possible scenarios for a Russian military invasion
of Ukraine should Putin take such an unwise step. They are highlighted below
from least to most likely. This analysis does not consider hybrid efforts such
as instigating a coup d’etat as Ukraine’s President Volodymyr Zelensky fears.
Western responses to a military attack would vary depending on which
alternative Putin chooses.
The
first alternative is to occupy all of Ukraine. This seems unlikely since it
would be very risky diplomatically and expensive militarily for Moscow. Russia could lose. Putin
appears interested primarily in Russian-speaking areas of eastern Ukraine. The
Western response to an all-out invasion could be fierce, including possibly
providing airpower to Ukraine to defend Kyiv should Ukraine be losing the
battle. It could result in escalation and a major war despite lack of an
Article 5 commitment. Putin likely knows this. Therefore, he is
probably—hopefully—deterred here.
Putin’s
second alternative is to seize all of Ukraine’s coastline from Donetsk to
Moldova, including Odessa. If successful, Ukraine would be land-locked, it
would lose up to half of its territory, and Putin would have control over the
territory of most Russian speakers in Ukraine. But he would also have to occupy
the primarily Ukrainian-speaking area between Odessa and Crimea, which could be
very hard to hold onto militarily. The Western response would also be severe,
including possibly some form of closer relationship with NATO for what is left
of Ukraine in order to help protect it. This is not a likely option for Russia
either unless Putin has strong initial military success and the West balks.
The
third is to seize the coastline from Donetsk to Crimea along the Sea of Azov,
through Mariupol. This is mostly Russian-speaking or bilingual territory. In
addition, controlling all of the Sea of Azov would have great strategic value
for Russia. Crimea would be connected by land to the rest of Russia. This too
would result in very heavy fighting, and Russian troop losses would be
significant. There would likely be a strong NATO reaction. However, the West
would probably be less likely to send in military force to support the
Ukrainian military directly since the activity is not near NATO’s borders and
is primarily in Russian-speaking areas. Massive Western sanctions and arms
shipments to Kyiv would be likely.
The
fourth alternative is the annexation of the Donbas region currently occupied by
Russian forces. This might be accomplished with or even without the deployment
of additional Russian troops into Ukraine. Russia’s current force posture on
Ukraine’s borders could serve as a message to Kyiv not to respond to annexation
militarily. This would be the least dangerous of the four alternatives for
Putin since Russian troops are already there and he has already gotten away
with one annexation. Nonetheless, he would lose all pretense of his “little
green men” excuse and of Russian innocence. The West would probably respond
diplomatically, with much stronger economic sanctions, and with massive arms
transfers to Ukraine, but not with Western military deployments to defend
Ukraine.
This
fourth alternative may be Putin’s most attractive option if he decides to use
force. It’s an alternative for which NATO needs to plan.
The
hope must be that Putin will take up Secretary Blinken’s invitation at Riga to
reengage in the Minsk 2 peace process and not pursue one of these military
alternatives. The world is already a very dangerous place. A Russian military
attack on Ukraine would make it much more so.
Hans
Binnendijk is a Distinguished Fellow at the Atlantic Council and served
previously as Director of NDU’s Institute for National Strategic Studies and as
NSC Senior Director for Defense Policy and Arms Control. Barry Pavel is Senior
Vice President at the Atlantic Council and Director of the Scowcroft Center for
Strategy and Security. He served previously as NSC Senior Director for Defense
Policy and Strategy.
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