The diplomatic picture adds further uncertainty. Trump described his meeting with Iran's delegation at the UNGA as very good and indicated further discussions are scheduled.
The global cost of carrying crude oil which used to be around 1-2 per cent of the total contract value has now faring 20-25 per cent to Asian refiners.
Brent crude futures and US West Texas Intermediate crude touched their lowest since September 10 earlier on Monday, with Brent at $101.71 a barrel by 0213 GMT, down $2.16, or 2.08%
Brent crude futures fell $1.01, or 1%, to $103.77 a barrel by 0020 GMT, while US West Texas Intermediate futures fell $1.03, or 1%, to $100.88 a barrel
Brent crude futures fell 93 cents, or 0.86%, to $107.82 a barrel at 0028 GMT, while US West Texas Intermediate futures were down 97 cents, or 0.92%, at $104.86 a barrel
Brent crude futures rose $1.24, or 1.18%, to $106.93 a barrel at 0026 GMT, after climbing 1% previously, while US West Texas Intermediate futures were up $1.29, or 1.24%, at $102.65 a barrel
Brent crude futures rose 81 cents, or 0.8%, to $108.44 a barrel by 0345 GMT while US West Texas Intermediate crude rose 69 cents, or 0.7%, to $103.17 a barrel
Gold edged lower in early trade on Comex after opening at $4,448 per ounce, with the precious metal last trading at $4,458.90, down $1.80 from the previous close