Why Is Russia Wary of Montenegro Joining NATO?

For the first time in six years, NATO announced it would expand its membership, extending an invitation to the Republic of Montenegro just six years after its independence from Serbia. Notably, merely 16 years prior, NATO had bombed this small Western Balkan nation as part of its intervention in Kosovo.

What raises considerable intrigue regarding this issue is the country's military stature. Montenegro's standing regular army does not exceed 2,000 troops, making its accession virtually negligible in terms of adding military muscle to the Alliance. This step appears to fall within the realm of a provocative act to test Russia's reaction. However, in reality, this move carries profound political consequences for the conflict between the two major powers. It underscores the Alliance's ongoing advance in the Western Balkans generally, and Montenegro specifically, through programs that urge regional states to undertake a series of political, legal, and military reforms under direct NATO supervision. These programs assist countries striving for accession or targeted for membership proposals.

This newly independent state could reach these supported standards within a short timeframe to achieve alignment with the Euro-Atlantic community.

Furthermore, Montenegro's membership represents a major step toward enhancing political stability and democracy in the Western Balkans. The reforms pledged to reach this stage include bolstering governance structures and democratic institutions, as well as modernizing its military to meet NATO standards. This step serves as an inspiring catalyst for others, such as Macedonia and Bosnia and Herzegovina, to reactivate the necessary reforms for eventual membership—a process that had stalled in both nations. The invitation was also intended to signal to Georgia and Ukraine that the "Open Door" policy remains active despite Russia's annexation of Crimea.

Russia has fiercely opposed NATO expansion due to deep-seated historical anxieties regarding the scenario of "encirclement" by a potential adversary. Domestically, Russian President Vladimir Putin has sought to amplify the threat of NATO as the country's primary geopolitical enemy to stoke Cold War-era tensions and consolidate domestic power. Consequently, curbing NATO expansion is a strategic priority for Russia, a threat formally incorporated into its updated 2014 Military Doctrine.

Unsurprisingly, Russia swiftly condemned NATO's invitation to Montenegro—a country that gained independence with support from Russia, its natural ally in the region. The Russian Foreign Ministry labeled the decision "a dangerous and openly confrontational step fraught with destabilizing consequences for the Euro-Atlantic security architecture." Subsequently, Dmitry Peskov, spokesman for President Putin, declared that NATO expansion "cannot lead to anything other than retaliatory measures from the Russian side."

In light of such warnings, Russia is likely to respond through political or economic channels rather than military escalation. Pro-Russian groups in Montenegro have already taken to the streets to protest NATO membership and demand the resignation of Prime Minister Milo Đukanović. Moscow could further incite civil unrest to make the country appear too unstable for NATO integration. Domestically, Montenegro faces anti-NATO factions, including elements within the Orthodox Church and political parties that emphasize strong ties with Serbia and Russia while expressing resentment toward Western and NATO policies.

Simultaneously, Russia wields significant economic leverage over the small nation, particularly in tourism and real estate (an estimated 40 percent of Montenegrin real estate is owned by Russian entities). Having already banned food imports from Montenegro after Podgorica aligned with the West over Ukraine, Moscow could impose further sanctions to punish the country for its pro-Western geopolitical ambitions.

On the home front, the Montenegrin public remains skeptical about whether NATO membership will bring economic benefits. Public opinion is cautious regarding the government's motives, accusing Prime Minister Đukanović—the key figure driving the NATO integration agenda—of abuse of power, embezzlement of public funds, and financial corruption.

Should the 28 NATO member states vote on Montenegro's membership next year, Russia will likely leverage political parties in countries most receptive to Russian financial influence—such as Hungary, Greece, and the Czech Republic—to lobby for a "No" vote. Since NATO decisions require absolute consensus, Russian influence remains a potent factor in this regard.

However, the most probable scenario is that Russia will focus on preventing Serbia from following Montenegro's path. In recent years, Moscow has actively consolidated its influence in Serbia and Republika Srpska (the Serb entity in Bosnia and Herzegovina) through economic aid and military cooperation.

Undoubtedly, the European Union's launch of accession talks with Serbia following NATO's invitation to Montenegro highlights a high level of coordination between NATO and the EU—two institutions that often struggle to align due to internal political divisions between members like Turkey and Cyprus. Yet, this development also opens new avenues for Russia to derail progress in the Balkans, either through Serbia's EU integration talks or via the 2013 EU-brokered peace agreement between Serbia and Kosovo.

Crises in the Middle East and Ukraine have pushed the Balkans lower on the priority list for many NATO leaders. However, it is time to refocus on the region. Relative peace and calm should not be taken for granted; economic distress and the refugee crisis have strained fragile Balkan democracies, creating fresh vulnerabilities for Russian intervention. Bosnia faces risks of sliding back into political turmoil following ambitious democratic reforms, while Macedonia has suffered severe setbacks amid a government wiretapping scandal and ethnic violence in the Kumanovo region. Even the Serbia-Kosovo peace agreement remains fragile, evidenced by protests in Kosovo last November against a government proposal to integrate Serb-majority areas—a move backed by Brussels.

These dynamics reflect deep-rooted political, ethnic, and economic tensions that have resurfaced despite apparent progress toward Euro-Atlantic integration. Combined, these factors drove NATO to invite Montenegro, as Western policy seeks to reopen the Balkans file amid a potential revival of Cold War dynamics. Nonetheless, lasting peace and stability in the region remain far from guaranteed.