The FTSE 100 ended flat on Monday as gains in energy and defence stocks were offset by losses in consumer staples and healthcare. Oil giants Shell and BP rose nearly 1% each, tracking a 3% jump in crude prices after OPEC+ kept July output increases steady. Defence stocks also gained, with Babcock up 8.2% and BAE Systems up 1% ahead of the UK's Strategic Defence Review. Gold miners rose 6.2% as gold prices hit a three-week high, boosted by a weaker dollar and renewed global trade worries. Meanwhile, big exporters like AstraZeneca and Unilever dragged the index as the pound strengthened. Trade concerns grew after President Trump announced plans to double tariffs on steel and aluminum, prompting EU warnings of retaliation. On the data front, UK mortgage approvals fell to a 13-month low, pressuring homebuilders, which dropped 1.2%. Still, a survey showed manufacturing in May was not as weak as feared.