Washington (CNN) Concerns about Russian aggression is driving billions of dollars in US arms sales to European nations. The weapons deliveries are also part of the Trump administration's wider efforts to confront Russia in the region.

The Trump administration announced Wednesday that the State Department had approved a potential sale of the Patriot missile system, including some 100 missiles, to Sweden.

The system's missiles are capable of intercepting short- and medium-range ballistic missiles as well as drones.

US and European officials have expressed concern that Russia has recently deployed new missiles to its European exclave Kaliningrad, which sits on the Baltic coast between Poland and Lithuania.

A US defense official based in Europe said Moscow's recent deployment of its Iskander missiles to Kaliningrad was "the biggest move we've seen" in terms of Russia's militarization of the Baltics.

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