There is also a flyway through the West Plain, part of the Tisa Plain, shared with Hungary and Serbia, which is used by cranes and Passeriformes. The secondary flyroutc passes through the Transylvanian basin, from northwest to southwest. The most recent CoP adopted the Protocol on the Protection of the Marine Environment of the Black Sea from Land-Based Sources and Activities and a revised Strategic Action Plan. The entry into force of the Protocol is still pending and there are implementation problems related to financing.