Some visitors thought it was all part of Russian exhibit, while others suggested calling the police.

The "On Vacation" art project by anonymous activists mocked Russia’s infamous “little green men” and made visitors feel what a “Russian occupation” might look like, Ukraine Today reports.

Visitors were also invited to join a “militarized vacation” project.

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According to the activists, the project that will last until June, 8 aims to give foreigners a better understanding of Ukraine’s reality today.

The Ukrainian pavilion opened on May, 7 with a concert by prominent Ukrainian rock band Okean Elzy.  

Ukrainian Internet resource Platfor.ma published an article on the event written by Yuriy Marchenko and Oleksandra Kovaleva.

See unian.info’s video section for more of the latest news from Ukraine in video from Ukraine Today, Ukraine’s 24-hour English-language news channel.