In the upcoming summits with Japanese Prime Minister Fumio Kishida and Philippines President Ferdinand Marcos Jr., President Joe Biden is expected to express serious concerns over China’s escalating activities in the South China Sea. What Happened: Biden will discuss the situation around the Second Thomas Shoal, a submerged reef in the Spratly Islands. The Chinese coast guard has allegedly used water cannons to prevent the Philippines from resupplying marines on the Sierra Madre, a ship lodged on the reef for 25 years, reported The Financial Times. Senior US officials disclosed that Biden will…