By Marwa Rashad and Belén Carreño LONDON/MADRID (Reuters) – Dozens of ships carrying liquefied natural gas (LNG) are circling off the coasts of Spain and other European countries unable to secure slots to unload because plants that convert the seaborne fuel back to gas are full. Europe is facing an energy supply squeeze as Russia has progressively cut gas flows after the West imposed sanctions in response to the Ukraine war. The region has had to find alternative supplies, including LNG, but the arrival of multiple cargoes of the superchilled fuel has exposed Europe’s lack of “regasification” …