Amid new accusations by Kosovo Albanian refugees of Serb police intimidation, NATO secretary general Javier Solana yesterday said that despite some progress, the Yugoslav president was far from meeting tomorrow's deadline for compliance.

Solana said he delivered ``a simple, but very strong message'' to Milosevic that he must comply, ``he must comply fully and immediately with the requirements''.

``According to our information, and our information is good, many army and special police units remain in Kosovo,'' Solana said after he met Milosevic.

``These units must be withdrawn immediately,'' Solana told reporters. ``Let there be no doubt, we will keep the situation in Kosovo under closest scrutiny. NATO will maintain pressure until we have evidencethat compliance will be achieved.''

The air surveillance deal was signed yesterday in Belgrade between NATO's supreme allied commander for Europe, US Gen Wesley Clark, and Yugoslav army chief-of-staff Gen Momcilo Perisic. It calls for unarmed spy planes to watch over Milosevic's compliance to withdraw his troops from Kosovo and allow safe return of tens of thousands of Kosovo Albanian refugees.

``Any attack or hostile Internet against our NATO verification aircraft will have the gravest consequences,'' Solana warned.

International officials also huddled in Paris and Vienna yesterday to push ahead the assessment process aimed at making sure Milosevic adheres to the breakthrough agreement reached this week with US envoy Richard Holbrooke.

In Vienna yesterday, the Organization for Security and Cooperation in Europe agreed formally to oversee the 2,000-member ground verification mission -- unarmed monitors who will roam through Kosovo to make sure terms of the agreement with Holbrooke are beinghonoured.

The OSCE said in a statement that its current chairman, Polish foreign minister Bronislaw Geremek, will sign the ground verification agreement today in Belgrade with Yugoslav foreign minister Zivadin Jovanovic.

Poland's ambassador to the OSCE, Adam Kobieracki, told the Austria Press Agency

that the verification mission could cost about 200 million dollars, with the United States, Britain, France, Russia, Italy and Germany assuming most of the burden.

In Kosovo, the UN refugee agency delivered more aid to those displaced by the seven-month crackdown in the secessionist Serbian province, which is populated overwhelmingly by ethnic Albanians.