European Council President Shell.

Michelle said in a letter to four You leaders that the bloc should explore all options at its disposal if negotiations with companies over delayed deliveries failed.

Meanwhile, Britain insisted it received all the shots it paid for after the European Union asked AstraZeneca to divert supplies from the UK.

British Cabinet Minister Michael Gove said Thursday the U.

K's orders must be honored.

The EU is lagging behind ex member Britain as well as the United States and Israel en rolling out the vaccine and is now scrambling to get supplies.

Is the West drug making giants slow deliveries because of production problems?

Vaccination centers in Germany and France are canceling or delaying appointments, and the U publicly rebuked AstraZeneca for failing to deliver even though the block hasn't yet approved the vaccine.

AstraZeneca CEO Pascal Sisario fired back that the you was late to strike a supply contract, leaving little time to iron out production problems that a vaccine factory run by a partner in Belgium.

UK Supply experienced similar glitches, he said, but they were sorted out because Britain signed a contract three months ago.

The swiftest mass vaccination drive in history is stoking tensions across the world as big powers by a vaccines in bulk and poorer nations, navigator financial and diplomatic minefield to collect whatever supplies are left.