US citizens face growing danger as government advises swift departure from one country

The advisory comes as the nearly four-year war between Russia and Ukraine continues to escalate.

Officials have limited ability to help Americans after the embassy in Moscow reduced its staff and consulates in Russia have suspended operations, the advisory notes.

The advisory says there is precedent for Russian security services arresting Americans on false charges.  

"They have denied them [Americans] fair treatment and convicted them without credible evidence."

Travelers were also told to reconsider bringing electronic devices into the country. It should be assumed that all electronic communications and devices are monitored.

"Log out of all social media accounts and do not access your social media accounts while in Russia," the advisory also instructs. "Prepare a will and designate appropriate insurance beneficiaries or power of attorney."

Russia's defense ministry shared footage showing a masked soldier standing next to drone wreckage, saying the wreckage was recovered from the attack.

The ministry claimed the drone carried a high-explosive warhead "filled with a large number of striking elements" intended to hit civilian targets.

Under martial law, authorities can set curfews, seize property, restrict movement, detain foreigners, forcibly relocate residents and limit public gatherings.

"Russian authorities have questioned, detained and arrested people for 'acting against Russia's interests,'" the advisory states.

"U.S. citizens should avoid all travel within 50 kilometers [about 31 miles] of the Thailand-Cambodia border, due to active hostilities and the unpredictable security situation," the alert said. 

Fox News Digital's Morgan Phillips contributed reporting.