Resolution 942, severed all commercial and monetary links to the Bosnian Serb entity. Notably, this cut the flow of fuel to the Bosnian Serbs, which was a critical blow against their strategic military assets. Due to the extreme position taken by the Bosnian Serb government, the Yugoslav Federation (Serbia and Montenegro) itself had to take a strong stance against the Bosnian Serb entity. This led to the quasi-complete diplomatic isolation of the Bosnian Serb entity. Deterioration in security In August 1994, the situation deteriorated again, as a result of sniper activity, despite the anti-sniper agreements. Sarajevo's "Sniper Alley" became infamous; deliberate attacks against UNPROFOR personnel or aircraft became frequent. In October, the Bosnian Muslim forces, trapped in the Bihać pocket, attacked the Bosnian Serb forces in an attempt to end the siege of the city. The attack and the ensuing counter-attack by the Bosnian Serbs terrorized the local population, causing another massive exodus of refugees. Bosnian Serb airplanes attacked the Bihać area with cluster bombs and napalm, deliberately violating the "Safe Area" status of Bihać and the "No-flight" zones. In reaction to this threat, on 21 November, NATO warplanes destroyed the Udbina airstrip, located in the UNPA Sector South in Croatia. The following days, NATO airplanes struck Bosnian Serb anti-air missiles sites that had previously fired upon British jets. NATO also carried out airstrikes against artillery sites which shelled Bihać. Instead of lowering their profile, the Bosnian Serbs retaliated by taking UN personnel hostage and restraining humanitarian aid transit. On the diplomatic scene, all efforts to reach and implement a cease-fire fell short due to Bosnian Serb obstruction—Dr. Karadžić declined the invitation of the UN Secretary-General. United Nations hostages and the Vrbanja bridge On 26 May 1995, following NATO air raids on Pale as the Bosnian Serbs defied another UN ultimatum on heavy weapons, around 400 Blue Helmets were taken hostage, brought to strategic points as human shields, and shown in chains on Serbian TV. On 27 May 1995, General Mladić along with General Nuhić launched an assault against the UN observation point of the Vrbanja bridge. At 5 in the morning, the French captain commanding the position lost contact with the 12 men and went to investigate. A Serb dressed with a blue helmet, French body armour and uniform attempted to take him hostage, but was deterred by the UN escort, and the officer managed to escape. In the