Singapore shares surged on Tuesday, despite the rest of the regional indices incurring losses as markets continued to wait the outcome of the US-Russia summit.

The Straits Times Index (STI), a key benchmark for the Singapore Exchange, ranged between 4,181.99 and 4,221.33 throughout the day. It ended the session at 4,216.19, up 28.81 points or 0.69% compared to Monday's close.

In company news, Global Invacom's (SGX:QS9) shares were up over 20% as its unit, Global Skyware, unveiled its XY antenna, which is suited for rapid response for mission critical applications.

Shares of Marco Polo Marine (SGX:5LY) were down over 3% at the close as the marine infrastructure company's gross profit in the fiscal third quarter declined by 4% to SG$14 million from SG$14.6 million a year earlier.

Meanwhile, Sinostar PEC (SGX:C9Q) was up nearly 6% at the close after it retired a 50K tons polypropylene installation owned by its subsidiary, Dongming Hengchang Petrochemical.