Trade war risk remains alive; EU won't engage with U.S. on trade until it gets a permanent exemption from "pure protectionism" of tariffs.

First day of Article 50 shows negotiations will be hard won.

First day of Article 50 shows negotiations will be hard won.

Eurozone finance chiefs agree to extend bailout funds to Greece for four more months; deal still requires approvals from ECB, EC, IMF, among others.

Eurozone finance chiefs agree to extend bailout funds to Greece for four more months; deal still requires approvals from ECB, EC, IMF, among others.

Sources say tomorrow Greek prime minister will ask creditors for six-month extension of loan agreement, buying time for talks.

Sources say tomorrow Greek prime minister will ask creditors for six-month extension of loan agreement, buying time for talks.

Finance ministers cut rates on bailout loans, suspend interest payments.