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              Congressional                                                      ____
           Sa  Research Service






Previewing NATO's 2023 Vilnius Summit



July  5, 2023

Leaders from the North Atlantic Treaty Organization's (NATO's) 31 member states (see Figure 1) are
scheduled to meet in Vilnius, Lithuania, on July 11-12, 2023. The allies are expected to address a number
of issues of interest to Congress, including efforts to deter and respond to a possible Russian attack,
NATO's  relations with Ukraine, allied defense spending, security threats posed by China, and Sweden's
pending accession to the alliance.

Enhanced Deterrence and Defense

Since Russia's 2014 and 2022 invasions of Ukraine, NATO has bolstered its force posture in the eastern
part of the alliance, including by deploying eight multinational battlegroups in the region. Since early
2022, the number of allied soldiers deployed to Central and Eastern Europe more than tripled, bringing
approximately 40,000 allied troops in the region under direct NATO command. The United States has
been a leading proponent of the enhanced defense posture and has deployed about 20,000 additional
military personnel to Europe since February 2022, including some under NATO command; as of mid-
2022, U.S. forces in Europe totaled approximately 100,000 personnel.
In Vilnius, the allies are expected to adopt new regional defense plans and force structure requirements
that NATO leaders characterize as the most comprehensive since the end of the Cold War. NATO leaders
stress that implementation will require increased defense investments from NATO members. Some allies,
including Poland and the Baltic states, also have called for permanent stationing of more combat forces
on their territory.

NATO-Ukraine Relations

In Vilnius, NATO leaders are expected to reaffirm support for Ukraine to eventually join the alliance, call
on allies to continue providing Ukraine with robust security assistance, and announce enhanced
partnership programs with Ukraine. Underscoring its role as a defensive alliance, NATO has declared that
it would not deploy forces to Ukraine. NATO has, however, helped coordinate an estimated $26 billion in
security assistance provided to Ukraine by individual allied governments, and has provided about $82
million in nonlethal support to Ukraine, including medical supplies and fuel.
Since 2008, NATO has reiterated a broad pledge that Ukraine will one day become a member, but has not
outlined a timetable or specific benchmarks for a formal invitation. The Biden Administration and some

                                                                Congressional Research Service
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