Security measures for President Trump's UK visit have been significantly heightened, especially around Windsor Castle and Chequers, with extensive air restrictions, aerial monitoring, armed police patrols, and river patrols in place.

The security operation includes a 'ring of steel' at Windsor, with the Royal Standard flag flying over Windsor Castle, indicating the presence of King Charles III, and a large American security presence.

The restrictions, which cover all aircraft including drones, began Tuesday and will last until September 18, with a temporary airspace ban extending through September 19 to ensure safety during the high-profile visit.

Thames Valley Police confirmed the arrest of a 37-year-old man from Brentford at Windsor Great Park for flying a drone in restricted airspace, and emphasized that suspects in England are not publicly named unless charged.

Authorities are urging the public to report any suspicious activity related to airspace or ground security, emphasizing vigilance during the visit.

Police have stated that breaches of these restrictions will be dealt with firmly, and the arrest underscores their commitment to enforcing airspace security during the event.

The airspace restrictions are standard procedure for such significant events, aimed at protecting both the local community and visitors.

President Trump’s visit coincides with heightened protests and threats, including demonstrations outside Windsor Parish Church and planned protests in London, with security measures including a heavily armored limousine, 'The Beast,' due to past assassination attempts.

The state visit involves a large security and ceremonial setup, including 1,300 troops and 120 horses, reflecting the event’s importance.

A man was arrested near Windsor Castle for flying a drone close to the castle during Trump’s visit, highlighting the ongoing security concerns and investigations.

Recent threats, including the murder of Trump ally Charlie Kirk and multiple assassination attempts on Trump in the US, have led police to deploy anti-drone equipment and firearms, with fears of sniper attacks or drone bombings.

President Trump arrived in the UK on Air Force One, greeted by officials, and is staying overnight at Windsor Castle, with no public events scheduled on September 16.

The security operation at Windsor is described as a 'ring of steel,' with some locals nicknaming Windsor 'Trumpton' due to the high security presence.