Mumbai, June 2 -- Copper soared today as metals witnessed a highly bullish activity amid weakness in the US dollar. US President Donald Trump warned of doubling tariffs on imported steel and aluminium to 50 % starting June 4. Donald Trump also accused China of violating the trade agreement reached last month while China also countered it with a similar charge against the US, thereby triggering worries over global trade talks following a favourable tilt in proceedings recently. This boosted precious metals clubbed with an escalation in the Russia- Ukraine conflict. Copper soared near $5 per pound, gaining as much as five percent in intraday moves as markets feared that the Trump tariff talk on steel and aluminium could soon spill over to cop...