What are two US Army spy planes doing over Lithuania?

Thousands watch two US Army spy planes – Beech RC-12X – over Lithuania.
According to the Scramble website, the US military is actively deploying the Beech RC-12X Guardrail in Lithuania where it conducts intelligence, surveillance, and reconnaissance (ISR) missions along the border with Belarus and Kaliningrad. Kaliningrad is a federal subject of the Oblast and an enclave of Russia located on the coast of the Baltic Sea.
US Army guardrails are operated in Lithuania from Siauliai Air Base.
The website says the RC-12X is a special electronic mission aircraft that provides an air intelligence, surveillance and reconnaissance (AISR) capability. The systems are designed to provide commanders with timely, accurate and tactical signals intelligence, or SIGINT. Intelligence gathered during missions is fed back to analysts operating ground stations, mainly outside hostile areas.
Here is the mission profile.
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